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I hope you can explain more, and perhaps answer what DaveF asked, it'll be helpful for me to write a neutral feedback to warn other [future] users of this... depth of KYC they might have to undergo, and their option, whether they'll get refund or are allowed to withdraw if they refuses to do so.
Unless someone complain that they are not able to withdraw the funds without verifying if a KYC request arises from them, this below quote from Rollbit is more than enough.
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We always refund users who are unable to complete verification steps.
There does not exist a single case where this is any different.
Perhaps I was a bit unclear with what I previously said and quoted above. I re-read the post and see it is quite ambiguous. What I tried to say is, I asked if they allow total withdrawal or just returning the deposit. It'll be helpful for me to know this, because I can use that info write an accurate neutral feedback based on their answer, to warn other users, whether to write "refusing to perform such KYC will void your winnings and only entitle you to your deposit" or, "refusing to perform such KYC will remove your ability to play on their casino with your progress so far paid to you" or, perhaps they can add more to this story.