I don't have enough statement about 1xBet and 1xBit are the same company or not, regarding with 1xBet have many football club become their official partner. For 1xBit have many scam accusation thread and this casino gambling claimed as scam and not allowed for promoting through signature code and get negative feedback if any one want advertising with 1xBit.
Seems can't find with 1xBet ANN thread in Bitcointalk forum, except they don't have any program with signature campaign but not any user have signature code for advertising with 1xBet. There are legal casino gambling or not I don't have specific answer after looking many football team have logo at their T-Shirt with 1xBet.
The fact is that 1xbet is heavily on marketing and sponsoring tournaments and clubs nowadays. They are the same company under different names. I read some articles about them using different names to advertise on tv and making it legal to post ads on tv where betting promotion is restricted.