@everyone who thinks KYC is only there to catch scammers, this is not the case and you mostly hear forum members talk about KYC that way when they haven't been around for very long.
Technically, KYC are just mandatory shit from its casino regulation bodies. And usually it is implemented with a third party company that is licensed to so it. As KYC for an account, any the same habit, footprints, practice, device usually tag as multi accounting, then lastly, KYC to prove it.
Data theft, if it really hits you hard, can destroy you.
It's a norm, everything in the internet to prove yourself that you are a person and not just a bot or someone, KYC is mandatory, but because of those breaches, selling personal info, due to ads, scams, sales, marketing, etc. it becomes worst. So provide your personal info only to those you think trustworthy enough.