I think most users don't want their data to be used by anyone and everyone. I sure don't. If one user needs access to their own data, they can always export it and take it where they please.

For most people the dangers of openness (see Cambridge Analytica), the lack of upside and the lack of security in small players mean that walled gardens are the best solution for the majority of people.

This lawsuit is exactly why people trust walled gardens to keep their data walled off. Because I trusted LinkedIn, not ProAPI and whatever malicious actors they sell to.