Yellz0 and Kaitlyn Krems are not "sex workers," unless you expand the term so broadly so as to include anyone offering titillation, at which point every model and most actors would fall under it as well.
So no, I am specifically not assuming they follow sex workers, I am assuming they follow people who offer titillating content, as expressed.
Are Hallie Berry, Drew Barrymore, Alexandria Daddario, Madonna, the singer Pink, or countless other people who have posed for commercial available photoshoots or video scenes "sex workers"?
If no, I'm going to need you to articulate how they aren't but Instagram and non-nude OF models somehow are.