For a typical gambler, what matters is that you are not cheating the platform and the most important thing a gambler would want to check is the KYC terms when playing because most gamblers don't joke when it comes to withdrawing their winnings and the moment there is an issue with funds withdrawal, then most players would underrate the casino and one reason why gamblers avoid reading these terms of services is simply because it is always bulky and in most cases, their terms seems almost the same for most of these platforms.
I don't just check for KYC alone, I check for whatever information that would prevent me from withdrawal like restricted regions and use of VPN because I know that if you're lucky to win big and break any of these rules above, your money is gone.
However, there are some casinos with short ToS which wouldn't take you up to two minutes to read through. That makes it very easy for customers to read. For me, it's very necessary to read the ToS of any platform that you will deposit funds into and not only casinos.
I totally agree with you that, checking just the KYC requirement isn't enough when talking about safety and winnings in a Casino because it's true that, if there is any major winning, and the winning account is been flagged to break any of these rules, there are very high chances that the funds is gone and might be very impossible to recover.
No matter how much a player wants to deposit on a casino either to test the site or play real game, reading the term of service should not be negotiated.