Censorship is a different issue. It is a political/culture war related, not denying me content because they want money from me, but denying me content because they think this content should not be available to anyone. It is a horrible thing, much worse than paywalling tbh, but completely different thing.
> I’m teaching to CS students and they consider facebook as "the thing used by their grandparents"
Mostly true, but that isn't that bad tbh. Grandparents have income, grandparents have time to spend, and grandparents aren't prone as much to jump to the next new shiny thing. True, they will eventually go away, but it's not going to happen very soon. So if that is true, Facebook has at least a decade, and maybe more because my generation (which would roughly be "parents" to your students) also uses FB, though much less now.
> I keep hearing that "mastodon will never replace Twitter" while it already has: there are now more links to toot on HN homepage than links to tweets.
Is there? I see two tweets links, and none of the "toots" (I will never get over the fact that this word means "fart"). I am no fan of twitter, but I am not sure how Mastodon would be better - all censorship fans are already there. I mean, you could use it as a blog, I guess, but why not just use a blog then?
> Free software are the only software that can stay successful for several decades
I was thinking that too, for a while. Until culture warriors started attacking the free software. Now I am not so sure. I mean, they probably won't be able to take down a huge project like Linux - too many people depend on it being there - but I am pretty sure they could destroy any smaller project. Think about it - how much abuse would a person be willing to take based on something they don't even get paid for?