Just anecdotal but as someone in the Pacific Northwest with a large Mormon population I have seen this occur in government and doctors offices, slowly everyone replaced by Mormons. My current office the practitioner I work with is the only non-mormon left and he's not happy about it. Mormons look out for each other, which ends up in this situation. It's nothing more nefarious than that but still off putting to those outside the church as it very much seems like a 'Mormon Mafia'.

Side note, out of prison Mormons were the only religion that actively supported ex-cons and would set you up with a place to stay and a job if you didn't have one. I seriously thought about converting just for the stability (and still might). The Catholic church had monks come to prison but I couldn't even get a visit with a priest/monk at my previous church once outside to just talk about coming back to society, my fears, and re-adjustment. Or a single parishioner to talk with. But they did offer tele-counseling (if I had insurance).