Well, I have been trying to access Bitz for the last few days, and I always end up with the error Sorry, you have been blocked.
Were you trying without a VPN? I just checked now and I don't see that message, I can access it without any problems. Sometimes that type of message appears when your country (or the country you are accessing from via VPN) is trying to block the casino. In any case, they have a good mirror system to avoid these problems, as you have seen.