Other than entirely community-driven projects (like https://wanderer.to/ mentioned in the article), are there company "forms" that legally protect against this kind of sell-out? Like non-profit or public-benefit-corporation? If users are contributing the content of the app, it seems they should have a way to hold the owners accountable.
There are non-profit corporations which seem on their face to address the issue, but not knowing much about how they work, it seems to me that it is often too easy to convert them to for-profit corporations, as happened with Raspberry Pi. I think in Europe a lot of open source organisations are "foundations" which seem to operate on similar principles. IMO non-profit or charitable status is a must for sustainable, op…
Easiest? Pay yourself a nice fat salary and use most of the rest of the money to hire “nonprofit management companies” which may or may not be you or your friends in a cheap costume.