Note: Forgot to add, this is going to give some low level data or software engineer access to all of your darkest secrets and what is to stop them from using that to blackmail you? Some guy is going to ring up their local millionaire and say "I see you are into X, give me a 100k or everyone else will know as well" There is no end to how bad of an idea this is.
They are normalising people being asked by potentially shady sites to subject to identification procedures, after all.
If I was inclined to sell such information illegally, I'd set up a bunch of honeypots and "verify" users and just hoard the data to sell.