They never learned to control and own their systems.
Then those users start buying other computers, with software they didn't have the option to control, in the form of smartphones.
Now there are huge swaths of users who are so used to being stuck in a user prison they don't own or control that they think it's normal!
It's not. Join the GNU+Linux revolution today!
So the problem with fb and twitter etc, is that they took what would have been a great model (individual websites) and tried to force everyone on their platform and then find various ways to lock them there... and now with all the backlash there is a growing awakening of computing freedom, but the problem is they keep thinking of blockchain or meshnet style decentraliztion to fix the problem, when the real problem is one of ownership.
So in my opinion we need a good copyleft foss federation tech and people to own their own data. The internet isn't fully decentralized... it's more of a heirarchical starspoke topology, and it's high time SV and the rest wakeup from buzzword bingo of decentralization. (If I hear one more story about how we don't need servers cause we're going to the cloud I'm going to explode, for example).
This is also why I think something like the freedombox is probably the closest thing to what the future lookes like.