afaik, the KYC problem lies only in whether or not you believe in the gambling site you are playing on, however, don't give your personal data carelessly, but if you are sure of the gambling site you are playing on, there's nothing wrong with that.
Again we come cross a situation in which we don't have a choice that we do not give our KYC data in order to gamble. It's better that we made up of our mind that we have to give the KYC data no matter it is the gambling site who are asking for it or the cryptocurrency exchanges where the KYC is mandatory.
I am not saying it that we give it to all the sites but we have to believe that the good sites will not misuse about our data.
Like you have said, for those who do not want their personal data in multiple online servers, best thing to do is to find a reputable casino they trust, pass the kyc verification and play there, playing on multiple casinos also means you agree to pass kyc verification on multiple casinos if the need for it arises.
But the problem was recently heard that there was a problem of casino customers who complained about frozen funds and were asked to do KYC but failed.
Without me mentioning this problem, of course we know who the people who are complaining are, but the main problem is that sometimes a casino that has a good reputation will also be suspicious and really need customer data to ensure that everything is fine.
As long as we don't violate casino rules I think giving KYC to trusted casinos won't hurt.
but still they do fail on giving out despite of those things that had been complied. We havent heard out on Stakes side on whats the actual reason on why they've been still holding those funds despite of such compliance on whats been asked? ID's should really be enough but thing here is that they've been asking for more which i would say that it is really just that too much.
I dont believe that 6k isnt something that would really be a bothersome amount on Stake, what boggles me is on how they do really trying out to hold up those funds and
asking too much information and documentation for that mere amount.