On many sites where I am registered, sites of varied topics, I have noticed that some few of them require that a new registrant make their first post in the introductions thread. Newcomers are limited to this simple hurdle, then may proceed at will.
Just their very first post, but they must and further access is not granted until they do.
It is not too difficult and IMHO not to much to ask for someone joining a community to make their first post by stopping by the introductions thread to just say "Hi". Life story not required, just the simple and very basic human "hail, friend" which has existed since before recorded time when one encounters a new group for the first time.
Too much to ask?