It is now 100% sure, 1xbit is owned by 1xbet (even though they say they aren't) look, I created an account using Korean VPN:

1xbet is owned by BetB2B. BetB2B is a platform, ready CMS that gives them the possibility to create as many casinos as they want with their own CMS and ready-made templates. Basically, they buy domains, use their CMS to create many casinos and scam people endlessly. I don't have valid proofs but I think that 1xBet is the main product of BetB2B, they even had the same brand colours.
As it seems, they forgot to change the name 1xbet with 1xbit on their Korean page. They are the shadiest company that I have ever seen in my life. When I ask them why do they have the same template, they always say that it is just a coincidence and that's all.
I thought BetB2B were only concerned with selling software to create gambling site.
If what you say is true, then I believe that there are more sites that we have to be cautious about - few weeks ago a thread was created with a list of site that used the BetB2B and since since BetB2B owns 1xbet and 1xbit is it also safe to say that they own they others in that list? I’m kinda curious.