Are banks so afraid to be associated with sex, they'd rather lose the business completely? Porn made VHS big, porn made the internet big, and now porn is "contributing" to making crypto big. And if it works for sex, eventually it will work for anything else too. Don't banks realize that business lost to crypto is lost to them forever?
I can make a comment for Germany: Yes, banks do not want it. It is not easy to open a bank account, even if all business documents are complete and the business system is positive. Very difficult, you should know someone in the system, then it becomes easier.
The restriction of middlemen forces these sex workers to find another way to get their payment effectively. It's the same experience with some people online where the transactions had been reversed. As a result, they turn to BTC to avoid such problems.
One problem left for this adoption to really make its way for BTC to be used as currency is finding stores that will actually accept BTC directly without having to cash out and turn BTC into USD. So far there are few stores still.
From my point of view, bitcoin and sexwork are not yet ready for it. It's the cash that everyone wants, the smallest bills are not paid digital and I see it every day and I understand it too.
Digital transmissions are normal for live cams, but if someone wants an escort or goes in a club, cash is king. I can report from Germany and we can talk about ideas here. I would like to see a way for sexworkers to use their hard earned money legally without any problems. But it's a really difficult, because the women also don't want to pay taxes and run to Western Union and pay a lot of fees for their money to be transferred.