I know one who was a masseur but didn't tell people who he was. He was talked about negatively on forum but couldn't say anything as there was no point in trying to defend himself. He was pretty discouraged to see how negative things got. I think many lurk quietly.
When you go to his ad it says he has frozen his membership so doesn't look like he is back yet officially. He has had a rough year with personal matters so he probably isn't working as much and needs his breaks.
The red flag for me is all his reviews are in one month. But the one negative review who also wrote a positive review seems to indicate the body matches.
I understand your point and why it can be frustrating. I have been guilty of asking last minute before.
At least for me I live in the suburbs so am not always out where most of the providers are. So if I find myself in the city then I may ask someone if available. But other than that I try for 24 hour notice.
I've been given a glass of water several times. I have never thought about it's source which is obviously some open container. Something to ponder. Well I've never been sick or poisoned so I guess all is good thus far.