Think that someday you won a big amount of money and you thought that you're lucky and this amount will change your fortune and all of sudden, the site asks to verify your phone number or documents, and you're left with nothing as you provided the wrong details. If you want to fortify your money, then you may take chances, but I will not recommend using a fake identity where you are putting your real money.
I can't understand why so many users are still discussing this subject. Roobet made passing level-1 KYC mandatory long time ago. By submitting fake information, the user is not only risking to lose his coins but he is literally cheating (there is no other word to describe it). Of course, there is no way to prevent people from doing it but they need to assume the consequences when they get caught, and they will.
If you don't want to verify your identity then look for a casino which do not require it.
For the sign up and other promotion I guess? This has been happening for a long time, Cheaters and abusers are doing this to earn that bonus that the casino is offering. I think Mandatory level 1 KYC is one of Roobet counter measure so that if cheaters and abusers are caught, Roobet can verify them.
I guess those abusers can't be stopped by the alluring promotions of Roobet. I think it's not worth the risk of abusing the casino over few dollars.