Whales will possibly avoid this casino due to that reason so maybe they should think about increasing their limits so that they can attract user since as you said many gamblers didn't like to spread their identity everywhere and possibly they will get small time gamblers who will just want to try their site so they should think about good things for betterment on this casino if they really want this to success.
I do not think that whales would care about KYC, I do not know many places in the crypto world where you can actually end up spending a million dollars without giving any KYC at all, it is near impossible because that would be money laundering heaven and that is why it is basically not allowed anywhere. All the above, we should not be considering this as a way of avoiding this casino, just because they have KYC doesn't mean whales will not come here, 2000 euro is a lot, I think they could drop it as much as 500 euro for example and that would still be fine.
I gamble in many places and I do not gamble a lot monthly but whenever my total reaches to a high level they eventually ask me for my KYC, there are even places right now (like roobet) that asks KYC even without gambling at first, it is definitely something that we should be considering normal at this stage.