Considering that the majority of OF accounts make only around £130 per month it's hardly going to be a huge blow for many.
From what I can see on Google, the top 10% of OF accounts make 73% of all the money and the top 1% make 33% of all the money earned on the platform. Unless you're inside probably the top 5% it's not the grand money making scheme most people think that it is.
But all sorts of women are joining the site. So the percentage figure is relative. The top 10% making the 73% are maybe the women who you'd wished escorted and paid to see for such services. And the other 90%, maybe you won't pay to see as an escort. So the potential quality escorts who you'd have loved to see for in person services are kept online on the likes of Onlyfans.
Also if a potential quality escort can't yet make good money online, she'll still try to damn hardest. I mean others are doing it, so why can't she, she'll say to herself. And if she still can't make it online, then she'll quit altogether or do escorting at a crazy high price. If other girls are making good money online, then I'm worth a lot more and charge more as I'm offering in person service, will be her thinking. Hence the crazy escort prices and lack of talent these days, spoilt by men who pay online girls, for the detriment of all men. Sad thing is those same online paying guys wished their girls did in person meets. They don't click that they've given them good reasons to not ever have to meet them in person or escort. These men need to be shown how they're damaging the real fun for paying for sex - the real in person meets in the flesh, not online limited virtual meets on a screen they wank to.
E.g. on another forum, a punter was saying how he'd wished some hot Russian cam girls he cams with did escorting too, and he only finds average EE girls escort. Doesn't click he's paying the Russians not to escort by paying to cam, and the average EE ones escort since probably he wouldn't pay them on cam.