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.
Yes. I initially tried without a VPN, and later attempted it with 1.1.1.1 VPN, and I was still getting the same error message. I think you are right, my country has blocked a lot of casinos lately. But I was able to access Bitz at the beginning of september, but the problem started a few days ago and I thought it is temporary and I would be able to access the website later. This is why I didn't complain or didn't try to use other ways to access the website.
Since I am already connected with the Bitz team, they helped me by giving the links to the mirror domains where I can access the website without any trouble.