I am sorry but this is just completely wrong. Look at the live feed of mastodon.social which will give you an actual sampling of what people talk about and tell me how many Linux related comments do you see among the first 100 or so. I got 2 on my first try and 0 on the second.

I happen to be a long time Linux user but I don’t seek out Linux stuff on Mastodon. My feed is mostly boardgame related stuff, which is what I am here for and what I follow. There is no algorithm so what you get entirely depends on what you follow.