I finally quit my barren Twitter when the Musk takeover resulted in my feed being flooded with porn (including illegal content) and arabic carpet cleaning ads. I seriously doubt anyone's default Reddit front page has ever looked like that.
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.
Ah, ok, yeah, you're right, that did (and still does) happen to me. I had forgotten about that, I just ignore followers now.