You don't know how social networks work. They only survive based on network effects, if they don't have the most basic functionality that users expect (like complying with privacy legislation), then they will fail to reach critical mass and be outcompeted and die.

If the devs don't want to provide the most basic functions that any user of a social network would expect, they're welcome to be downvoted to hell and have their project go back to being one of the millions of forgotten and unviewed personal github projects.

Open source projects die because it takes both technical talent and attention to your users to make a project successful, and for-profit companies often pay different people to do those.