The governments of the countries that grant licenses to cryptocurrency casinos are typically Caribbean nations, usually what are known as tax havens. Just as these jurisdictions—despite being more lenient—have gradually had to impose additional requirements, such as KYC, I believe the time will come when the regulations will change. In short, they will be equivalent to that of regulated fiat casinos in reputable countries, where you first have to pass KYC; otherwise, they won’t let you deposit a single cent.
Since being able to play without KYC is the main draw of cryptocurrency casinos, I believe this will ultimately kill the business as we know it today, but I think it will still be a few years before that requirement—KYC upon registration—is implemented at all cryptocurrency casinos.
Honestly, if I had a guarantee that in case casino scams me I'll be protected and the government will help, then I might be okay with the idea of doing KYC first before placing a bet. Of course, such licenses should come from developed and reputable countries where the law is enforced strictly.
By the way, even if KYC will be required upon registration, that's still not the end of the world, depending on your game of choices. I'm 100% sure that casinos with in-house games like dice, Plinko and so on, can function without KYC and license, just the way Bitcoin Mixers exist for example. KYC is mostly enforced because casinos offer slots from slot providers and live casino products like Blackjack and Roulette from different providers.