Earlier quoted context omitted.
I can't agree with this enough. The internet today is a cesspit, it needs a git reset hard back to the days when communities were based around forums. I made a lot of real life friends from the forums I frequented. Oh the good old days :(
On the one hand I feel exactly like you do, on the other hand I observe that my teenage daughter is making real friends on discord and game servers, just like I did on usenet and forums. So maybe it's you/me getting older rather than (just) the internet changing. Oh the good old days :( As do I, but I suspect much of what I miss is simply just being young and free and all that comes with that.
This would be less of an issue if users had clear legal rights (perhaps IP rights) to their own data.
I'd have fewer problems with "commercial platforms" if they couldn't rent-seek on free labour, ie., if the created content could be easily "replatformed".
Perhaps that's the next phase of the privacy war: the right to replatform.