They are business, they should not use false information to promote their service.
Without tx id/or winner testimony those made up banners are worth nothing.
If you don't want to believe the winning players here on the Roobet then nothing will force you. Don't waste your time and just focus on your own campaign. Also, how do you know and know that these are just false information? Is it just because you have nothing to expect?
There are actually some winning players who don't want to let them know they won or give their testimony, maybe for their privacy and security.