Which is fine if they are looking for escort work. Hosting isn't that.
I don’t think the opportunities you can get from casual sex equate with escort work - it”s more of a grey area.
Hosting seems to be an opportunity for some individuals to make money by meeting wealthy guests and providing additional services after the main social event - in the hope of getting something in return. Absolutely it causes problems for hosts and hostesses who do not use the job as an opportunity for exchanging sexual favours leading to access to money or other opportunities. I would certainly be impressed if there was a cultural change requiring people to behave themselves and not seek out casual hook-ups with people supplying them with goods and services. or while working.
As for the rest, how about the word of a vulnerable young women on a zero hours contract?
https://www.theguardian.com/world/2018/jan/27/other-city-events-tainted-by-presidents-club-style-harassment
It sounds like you mean people on zero hours contracts are vulnerable to not getting more work, as opposed to women having any unique vulnerability?
I totally agree that the negative publicity around the President’s Club dinner is useful to reinforce the message that sexual assault or harassment towards hostesses is unacceptable but unless a crime is reported and investigated there is little evidence of an actual crime. The Guardian article points to the need for guests to be advised to behave properly, a clear sexual harassment policy for workers so they know who to report incidents to, the need for workers to be trained to escalate incidents to get the behaviour to stop and the need for other people present at a social function to be prepared to challenge boorish behaviour as socially unacceptable at the time, though the guests could also be vulnerable to negative financial repercussions from their fellow guests if they did challenge the behaviour.