At the old times,their was only few casino and now was used by the few people.The price of bitcoin was around 500$ and will be distributed among all the winner.The kyc procedures was easy for before.Now the procedure of kyc hard.And they taking huge time for the verification of our kyc.So it’s hard to hold our Privacy.
Back then, crypto gambling has few competitors yet and at the same time, there are also few players. The gambling industry isn't much crowded and aren't abused by people, hence the KYC before is much easier compared today. Right now, there are many casinos and players already and these casinos and gambling websites are now abiding to the laws in which state they belong to. Regulation of gambling is now a thing because of increase rate of addiction and other repercussions as well as the tax revenue being generated in it.
If you don't really want to undergo KYC, there are still casinos and gambling website that don't really ask and mandate it. However, there's only a few left because most of them really ask for it for verification purposes the moment you will make a transaction such as withdrawal.