I would like to share my recent experience with Unibet with you.
I registered my account with them a few years ago and had a balance of 389€ on my account. When I logged into my account afer a few months of not placing any bets, I saw a notification that asked me to complete the KYC process. I uploaded all of the requested documents and waited for approval. They kept asking me for additional documents over and over again. Because it took them ages to approve or deny a document, this process went on for at least a month.
Edit: Complaint filed
When I tried to check the verification status yesterday, I was unable to access my account. I immediately reached out to the live chat and was told that my account was closed based on a management decision and that I could not withdraw my balance.
I'm a regular punter and have never had an issue with a sportsbook (besides one case where Bet365 voided a bet). The documents I sent them have been accepted by a number of bookies without issues. The bets I placed were all on major European leagues and the amount I'm up is minuscule. I always regarded Unibet as a reputable site and I'm really surprised they are pulling this off. There has been absolutely no wrongdoing on my side.