Happy to recommend BitDice as well, and I can vouch that if you use a VPN, as I'm forced to from my company all the time anyway, you won't have any issues.
Most Bitcoin dice sites are exactly the same too, they'll never ask for verification, they may block IPs, but using VPNs are fine as long as you don't use multiple accounts.
If the site performs some form of verification at any time, avoid. That's my advice.
We're also having that wager competition so it's a good time to try us out too. As well as some other competitions. There's a list if you type !contest in the chat
If not how often do these sites ban your acc?
Depends on how often and how much you win on that website.
When you wager big and win big, they'll be asking questions in no time by forcing KYC on you. When that happens you'll be losing your funds and your access to your account.
If you play small and keep your low profile, you'll probably go under the radar for a long time.
I believe this applies to many sites but this isn't how we at BitDice handle it. We simply won't allow bets if there is some issue (geo restrictions apply to some countries in which case you can't bet). If you can bet (and happen to win), the money is yours to keep without gimmicks.