You are correct, you can't tell if they're gonna be safe or not seriously, some very good-looking people are dangerous, some very unattractive people can be dangerous. It's just a safety precaution seeing who's coming to your home. If you have a security detail in tow, then they know who is at your home.
I certainly don't judge clients on their looks----- ever! That would not be fair, even though clients judge us on our looks, but that's ok, you're the one that's hiring. But I do know I've talked to some other Masseurs and they say they only want buff and ripped gorgeous men on their table to me, I'm like good luck with that. Everyone is entitled to a massage 😁
I don't know about other masseurs, what their idea behind asking for a face picture is..... I have just heard so many terrible things about other therapists that don't do the job, etc.