I had my fair share of strange actions by bookmakers just to slow me down.
One of them for example, I don't want to name it. I was down quite some money on that site and finally had a stretch of some weeks where I won really everything. I remember well, at one point I won 24 out of my last 26 bets. So I recovered a high % of my losses in that time.
I decided to withdraw some, which usually takes 1-4 hours, and went to bed.
Next morning no money in my wallet and a message from them my account has be "selected for a routine security check" . At that point I was with this site for 2 years, always deposited/withdrew from the same wallet, always used the same IP, always bet on the same sports. But now that I finally won some money back they do this. Of course it only had impact on my withdrawals, I could still deposit, still make bets, just not play poker because you could collude with somebody losing you money to that person intentionally to withdraw.
Anyway, this "random check" took 3 weeks, and we are talking about a 5 digit amount stuck on the site. They didn't ask for KYC, just I should wait.
I suppose they tried to trigger me into making more bets so I could lose it back, but that didn't happen.
After all those weeks they finally cleared my account, guess they couldn't come up with an excuse to not pay me. I also didn't get any explanation or apology. As another fxxx you in my face they limited me, even though I was still down money overall.
Needless to say that I withdrew all my funds and moved on, these kind of tactics are just ridiculous. Of course it's not a scam but it was definitely shady.
This reminds me of some ICOs in the past. Everything was easy on regards to sending the money, but getting the token listed, sending it to the users and basically being able to sell your coins, particularly if you bounty-hunted, was nearly impossible. It seems that some sites are following this pattern and yes, it is a scam IMO if you want to see it that way.