They have more than a hundred complaints against them yet managed to have a 4.3 rating on trustpilot somehow and continue operating. I have never used them to obviously I don't know how they work but all those hundred reports can't be wrong surely.
The primary issue is that 1xbit has links with powerful organisations like 1xbet etc which is why they have the power and money to continue operating for a long period despite all the scam accusations against them.
They utilise their power and money to acquire great ratings in sites like Trustpilot etc. They aren't really concerned about the negative criticism against them in Bitcointalk based on what I observed.
Money and power come from how you run your business. If 1xBit was massively deceiving users, I'm sure it wouldn't be able to survive 6 years on the market. I do not believe that no one would have taken a court case so far, and it seems that they are doing better and better. This shows that their services are good.