My opinion is a bit different. If it's for client use, clients can bring any toys they like.
It's not a big deal for an escort to pick up the toy by the part that never goes inside and slide a condom on it. Or use gloves or whatever else works.
Clients brining their own toys are very few tho. In 6 years of work I only had one such situation, as far as I remember.
If it's for escort use, yes, toys have to be personal or brand new in an untouched box.
And regarding the "reverse" situation from your question, technically, as escorts we should know better and desinfect any sex toys after each single use.
Plus, it's a lot more easier to get an infection on that particular part of a woman comparing to having anal play.