I think that the larger problem is that you probably aren't going to be an erotic actress for your whole life.
Like, what the authors seem to be focusing on is the degree to which teens might see this as an alternative to traditional work or being educated:
Another important finding was how strongly OnlyFans was associated with financial success. Teens repeatedly cited the platform as an easier and more appealing alternative to traditional work or education.
So, okay. Say you're a young woman and 20, and you make pretty good money putting on cat ears and licking a microphone or whatever's presently in vogue compared to most other things you could be doing at that age. But...are you going to be doing that at 30? 40? 50? Are you likely to make enough to retire off that in the time that you're successfully doing that? Because if you haven't acquired a skillset in that period for a lifelong career...like, if you forego education for that, that could be a really expensive exchange.
Now, in fairness, I kind of feel like some similar issues also apply to things like being a professional sports player. Short viable career for most sports, high risk of not being able to make it big enough to retire off earnings. But we also haven't had a radical recent shift in the pro sports industry.
I guess maybe pro gamers could be in a similar position. I don't know how many teens plan to do that (though I haven't seen a lot of material agonising about the number of teens who want to become pro gamers). I have seen a lot of material concerned about the wildly-beyond-what-can-be-sustained numbers who want to become social media influencers, though.
EDIT: Regarding influencers:
https://www.cbsnews.com/news/social-media-influencers-86-of-young-americans-want-to-become-one/
86% of young Americans want to become a social media influencer
I can't give you a percentage of society that can be viably dedicated to trying to influence others on social media off the cuff, but I am very confident that it is far, far less than that. If anything remotely approaching that level tries to do the field full time and make major tradeoffs for it, that's going to potentially be very costly for society.