They sell your data to other shitty companies, and spam around.
The worst you can do is to make a KYC, because they will sell your documents.
I made a topic about this few time ago, I will bump it because it can help newbies
How much does an Airdrop cost?
This is true. KYC is a load of crap to begin with. It's for money obsessed USA government bullies. The rest of the world don't care. Noone needs to know who you are and people who give their personal info away are insane.
Who knows what they do with it. How can someone feel safe knowing a stranger knows who they are what they look like and where they live?