That's very true. However, different denominations and religions don't have the same requirements. I'm ordained for officiant purposes, and could easily hang my shingle as Reverend Mold. My Aunt Barbara started her own church in the '90s. If a person wanted to buy a clerical collar from Amazon, go to a small town with no Catholic presence, and start taking confessions, they could. If or when they got caught, their punishment would be excommunication. It's not like they're practicing medicine without a license.

And the fact that predatory ppl seek positions of authority that are above common reproach is pretty clear. You don't get a more protected seat than the one at the mouth of god.