It would be best if you stop asking them to edit their posts but instead link the proof that the domain of the website is legitimately part of planetofbets.com. I mean, there are already posts suggest that the website is actually part of plnaetofbets.com. all you have to do is show it to them. then if they still think that the website is shady, then there is nothing you can do about it.

people here in the forum are usually cautious and they always assume(including me) new gambling sites are or can be a scam and that is why they usually ask questions firsts and investigate.