Some casinos that pose themselves to be decentralized are not totally decentralized. It cannot be decentralized and still be requiring KYC. Whose serve will recieve the KYCed data and for what purpose.
A totally decentralized casino is been hunted by the government and used for illicit purposes and that is why they do not gain much public popularity. Also the difficulty in setting it up is not what someone that just want to gamble for fun will want to do.
Whatever the type of casino, we can find it easily, especially since we have joined this forum for a long time, so we already have a list of casinos. And if we want to do KYC, we already know which casinos are trusted and which are scams so we won't worry about anything.
And even though the casino is decentralized, if we find indications that it will be a scam, we will not choose it but look for other casinos. So let's try to find out more about a casino before choosing a casino.
And trusted casinos will always try to protect the data or everything in the casino. And the casino will always increase vigilance and security so that data will not be leaked, stolen, or even hacked.
Just as you've mentioned, for the sake of the ones on this forum, we know them and how they operates, we cannot assume that KYC is not required when the casino is the type that request for such, there are many casinos one may try to look out for within and outside the forum for no KYC requirements for you to join.
But all that should be more soughted for is the trust in most of these gambling platforms, can they be that reliable to an extent, because the casinos that requires our information may later use them in tracking us and somemay not, but it's always better to stay off this uncertainties and avoid kyc at any means necessary or possible enough for us to use.