My 'For you' feed is almost exclusively Photography, science and tech news.

I believe it strongly depends on what you interact with.

At some point I also had a lot of US news in my feed, but once I stopped opening those posts and instead used the 'Not interested in this post' button or muted the author, they disappeared.

Probably following other accounts or liking photography posts also helped.

They're not on my For You feed, but anytime I watch a video on Twitter and it automatically jumps to a next video, it's always something that would never be on my feed. These days, it's usually bodycam footage from the United States (which I don't live in).

Meh, this borders on victim blaming. You can't deny they've done something to turn it the last few years. And there is no one of my interest left to follow, they've all jumped ship. I checked the "following" tab now, and there is nothing of interest there, they've all left.