@unknown that's correct. I wrote a couple of articles on my blog (kevq.uk) that explains how mastodon and federation work.
To answer your previous question though, as @OliverUv already alluded to, a lot of LBGT+ folk have a home on Mastodon, so you do tend to see a lot of discussion on that topic in the federated timeline.
Personally, I tend to stick to the people I follow and the local timeline. That way, I just see the stuff I'm interested in. 👍