I think it says something quite dark about our society as a whole that we have basically commoditised distress and are encouraging some people often themselves in dire circumstances to prey on others to the benefits of the middle men. I find these new pimps scarier than the old sort in that they pretend to have clean hands.
The free stuff isn't always as good, especially if you want something of a specific niche (fursuits, cosplay, etc). A lot of creators only upload cut-down vidros or "trailers" to free sites with a link to their OF.
At least in my case, I simply see it like the Patreon model. I like supporting some of my favorite artists, especially with something like an ongoing comic series I'll get previews of and vote on polls to influence. Onlyfans is the same if I particularly like some creator. It's great that we can directly support content creators of all kinds now.