So they probably don't bother to audition that kind of content for you very often because they already have strategies that milk your attention, engagement, and wallet better.
When you hear other people share their experience as new or different users, keep in mind how customized all these platforms are and how idiosycratically optimized they'll already be for you as a long-time, engaged user.
Most people can't go back in time to get where you are, and don't have any sure (or worthwhile) road to get there.
Towards the end, there would often be porn in replies of many posts on all kinds of topics, like politics, news, etc.
I used to use it years back. Some subreddits were really great but they all inevitability devolved so I lost any interest in maintaining active accounts there. r/skookum had really interesting content for a while but devolved into idiots reposting the same skookum brand wrenches over and over again.
The For You feed varies week by week but is generally okay. I make heavy use of lists, mute words, etc to clean things up.
X is a train wreck, but an interesting and useful one, depending on who/what you follow.
I bought a premium Prime account on Amazon, and yet some of their shows still have embedded commercials. grrrr.
Plus, I get constant ads to upgrade to Premium+ for ads-free.
Premium+ is probably what you have.
The very second the US election got underway all of our accounts started to heavily promote right-wing political content. Even though we specifically said when we signed up that we aren't interested in anything like that.
I haven't gone out of my way to restrict my timeline either, I follow ~1000 accounts I just don't follow or interact with accounts that post any of that crap.