What do you reckon will happen if she starts making good money on Only Fans? She'd escort less, charge more for escorting or give up escorting all together. Maybe she'll recommend other of her escort friends to go online too.
Guys complain here there's lack of quality escorts at good prices these days, and a lot of it is down to recent proliferation in online sex such as selling clips and camming. The girls that choose to do sex work now go the online route, when in past they'd have considered escorting. The simps have created a market for online sex not realising this in turn harms in person full service sex. The prettier they are, the higher likelihood they'll do well online and never have to escort. So you're mostly left with fewer in person sex workers, usually average looking, low level of service and at high prices. It also further encourages existing escorts, who hear about girls making good money doing online sex, to up their prices since they're actually directly giving you a service.
One popular escort used to do £100 an hour just a few years ago. Heard about the online sex craze and quit escorting to do cam work. Realised it's hard work for less money, came back to escorting and upped her rates to £200 per hour. Lack of other escorts and that she's giving a direct in person service made her double her rate.
So simps paying for online sex are killing the real in person sex for all other men and themselves.
Note: I myself have rarely seen escorts that advertise on AW/Vivastreet, massage palours, for many hears now hence no reviews. Kind of gave up paying for it and rather go civvy route. I used to before 2018 and when I was near Manchester, where I still think has decent escorts/massage parlours compared to other areas although even there is not like how it was.