What's the problem with people who have OFs making posts?

I see this in multiple subs. A hot girl will make a post about the subreddit which doesn't break the rules and isn't shilling her OnlyFans account, but people will see that she HAS an OF and will get upset that she posted to their sub, calling it "promoting".

Why is it an issue, if they're just making a normal post? Because they're hot?

I'm coming from a post on r/denim where a hot girl asked if skinny jeans were coming back in style, and everyone dogpiled her for having an OF account. I don't understand what the issue is - any insight?