It is your own fault that you have not read the rules that allows them to impose KYC on any customer at any time for any reason. There are a lot of people who like to multi account these sites unfortunately and one of the only ways for them to stop such activity is to look for unique identity documents. It is slightly lame that they do not force it at the point of deposit but they are clearly trying to reduce the amount of obstacles in the way of betting. They should definitely allow you to return at least the deposited amount without KYC, but I can understand also why they don't.