Unfortunately, I have not investigated this, but when it comes to the unavailability of gambling sites in certain countries, it does not depend on the blockade, but on the license. Each gambling site must purchase such a license. I don't know about 1xBET, but I know it is a very popular casino and bookmaker in many countries.
Even though they like to portray themselves that way, the truth is quite different. Because of the scandals exposed by the Sunday Times back in 2019, many doors have now been closed to them. In addition, an international arrest warrant has been issued for the owners for tax evasion, and they are probably hiding in one of the unknown non-extradition countries.