No bouldering wall in Toulouse and more or less no bouldering wall in Barcelona allow for loose chalk. They all require liquid chalk. Which is horrible and doesn't really work, or work temporarly because there is resin in the mix, cakeing the holds in a miserable slop. (Please don't use these products outside!) However, many of the walls tacitly allow loose chalk, if hidden discretely, at the training boards (as those cannot be cleaned regularly and imagine the state of those if people were using resin!). I avoid any gym not having a board were surreptitiously use of chalk is allowed.
Tops on is not a huge deal for me, super light weight vests exist for exactly this reason. Belay tests are fine if I don't have to pay for them. (I can pretend to tie in with a figure of eight for a day. I can even belay with an ATC for a day if my partner promise not to fall or hang.)
The biggest dealbreaker for me is bad or too unvaried setting in my grade range. Just leave and don't come back until reliable sources inform that the setting has gotten better.
I hate when I have to give up my phone number for membership. I do not trust gyms not to loose this data or have an employee sell it on (took about one week of having a new number in Spain until someone had sold it on to spammers/scammers). I should really have a fake number memorised for all such inquires. I have a fake email memorised that I always use if I have to give it up.