If you manage to participate in events recently then yeah you need to comply with their KYC as this was strictly implemented earlier last year but if you happen to join or play in the past? nope their KYC requirement is only for those under questioned and not mandatory , I have been playing and joining event for many times even before and yes there are no strict kyc back then.
but about the info of each account? I'm sure that this will remain safe and private as this will only runs from the team and the players involved.
I am not sure if that's the case. I have been gambling here way before KYC was a thing, and as soon as it became a thing they asked for simple stuff. I agree it wasn't like my face or anything, but I was still asked some information. So new or old, you are asked KYC to gamble here. It's understandable since they are multi-million dollar company and want to protect it.
The idea that you would get something amazing out of this is a big deal, and if you want to do that then you have to share some stuff, especially if you end up winning a huge amount since it would actually be required by law, since it's a huge amount, to make sure not a bad person got it.