In an earlier post, I argued that platforms can drift from their original mission because of internal forces: new investors, shifting governance, and growth metrics that gradually push them away from their initial “Why”. Community‑based platforms are not condemned to drift, but they need deliberate guardrails to resist it.

In this new note, I want to add another, more subtle source of mission drift: users themselves. When users multihome – that is, when they participate in several platforms that organise similar activities but with different missions – they can act as vectors of competitive dilution, importing norms and expectations from one mission into another. Over time, this can pull a platform off course, even if its governance and ownership structure remain unchanged.

Two missions in the same space

The Belgian boom in home exchange is a good illustration. In 2026, platforms like HomeExchange reported sharp growth in the country, with thousands of exchanges and tens of thousands of nights organised over the summer. The appeal is clear: for a modest annual fee, members join a community where families swap homes for holidays, often emphasising affordability, trust, and a more “authentic” form of tourism.

At the same time, many of these households also use short‑term rental platforms such as Airbnb, which operate under a quite different mission: monetised access to housing stock, priced per night, with hosts earning income and guests consuming accommodation much like hotel stays. In the Belgian context, Airbnb and similar platforms have been part of broader debates about housing pressure, touristification of neighbourhoods, and the commodification of homes.

So we have, in the same activity space – holiday accommodation – at least two distinct missions:

  • Home exchange: reciprocal swaps, low monetisation, community and trust, often framed as “alternative” or more responsible tourism.
  • Short‑term rentals: market transactions, income generation, yield optimisation, more tightly coupled to tourism and real‑estate logics.

Many users now operate in both worlds.

How multihoming dilutes a mission

When the same users participate in platforms with different missions, three mechanisms can quietly produce mission drift.

1. Norms travel faster than rules

A host who rents through Airbnb is used to thinking of their home as an asset that must generate revenue, be optimised for reviews, and be treated as a service product. When that host also joins a home‑exchange platform, they may carry over expectations about “equivalent value” (location, size, amenities), strict standards, and compensation for inconvenience. The original ethos of mutual hospitality – “we lend each other our homes” – risks being reframed as quasi‑transactions where parties negotiate “balanced deals”.

In such a setting, mission drift is behavioural: even if the platform’s official mission remains about reciprocal exchange, the lived norms shift towards more market‑like interactions.

2. Design follows imported expectations

As more multihoming users bring Airbnb‑like habits and demands, home‑exchange platforms may feel pressure to redesign their systems: more detailed filters, stricter rating and verification, quasi‑monetary point schemes, insurance options, and mechanisms for dealing with disputes. These features can be useful, but they also push the platform’s design towards the logic of a rental marketplace rather than a mutual‑aid community.

In other words, user expectations imported from other platforms can nudge the design away from the original mission, even if the platform was not “trying” to change course.

3. Community composition quietly shifts

Growth figures are encouraging for home exchange in Belgium: more members, more nights, more domestic exchanges, more visibility. But quantitative success can change the qualitative mix of motivations inside the platform. If the fastest‑growing segment of new members are users mainly seeking to optimise vacation budgets – rather than to participate in a community of shared hospitality – the de facto mission tilts towards cost‑minimisation tourism.

In that sense, multihoming can produce a kind of competitive dilution of the initial mission: the platform now competes not only on its own terms (“reciprocal exchange”) but also in a mission space shaped by commercial platforms, and users bring that competition inside the community.

Mission drift without betrayal

It is important not to moralise this too quickly. The households discussed in the Belgian articles are simply looking for pragmatic solutions: they combine platforms to balance budget constraints, travel aspirations, trust, and convenience. From their perspective, multihoming is rational and often necessary.

The point, rather, is analytical. In earlier work on mission drift, the focus was on platform leadership: who owns and governs the platform, which metrics they prioritise, how they finance growth. The home‑exchange case suggests that mission drift can also be user‑driven:

  • Users participate in multiple platforms with different missions in the same domain.
  • They import behaviours, expectations and risk perceptions from one mission into another.
  • Platforms, in turn, adapt design and governance to accommodate these imported expectations, thereby moving closer to the dominant mission logic.

No one needs to “sell out” or betray a mission; drift can emerge from the structural pattern of multihoming itself.

What this means for platform entrepreneurs

For platform entrepreneurs, this adds an extra layer to the mission‑drift problem.

It is not enough to define a strong mission, embed it in governance, and resist investor pressure. It is also crucial to understand where else your users are active, what goals they pursue, and how those external missions may bleed into your own.

A few practical questions follow:

  • In which other platforms do your users participate around the same core activity?
  • What mission do those platforms embody (commercial, civic, cooperative, speculative)?
  • Which norms and design expectations are likely to carry over to your platform via multihoming?
  • How will you respond when users ask you to copy features and rules from platforms with a different mission?

In the language of Platform Strategies, this is almost a question of mission externalities on the linkage map: the lower part of the canvas does not only capture external harms, but could also capture how external missions shape your own. Thinking explicitly about multihoming as a potential source of mission drift can help platform founders protect their “Why” in an ecosystem where users rarely stay loyal to a single platform.

‍