I'm an Admin on a Facebook group for performance Renault Clio cars, and for people to join up they just have to ask 5 simple questions for us to approve before getting in. Likely hundreds of thousands of groups have the same process, so it's not like having questions will come as a shock to anyone.
We get about 5 to 10 new requests for approval per day, and yes, I know there'll always be bots, but around half of these won't have answered all 5 questions (the bots never answer any). Sometimes they'll only answer 3, or 2 or whatever. We have it in nice bold wording that they need to answer all the questions before approval. but STILL some people just can't grasp the concept