As it was mentioned already, they have "powerful" marketing. Well, I would call it aggressive marketing. This kind of marketing makes people think like the company has a lot of money because they spend so much in marketing and logically this company should be reliable but this is where they make mistake.
1xbet has advertisement with Barca's players, this really makes sense among people, if they are partner of FC Barcelona, then they should be legit. 1xbit sounds like it should be owned by 1xbet, so, this company should be legit too.

This kind of thoughts make people to fall into their scam. Another fact is that 1xbit sometimes scams selectively. It makes people think like oh, those people were stupid and didn't follow the rules, if they did, then why wasn't my friend scammed?

So... It's sad but hope people will learn how to use google (or if google is shutdown like yesterday, then - bing and other search engines)