Biggest bonus. The revenue of a casino is an important factor, as bigger casinos. . Casinos Audit is an independent, free, and public database of online gambling sites and casino bonuses reviews. Casinos Audit is an independent, free, and public database of online gambling sites and casino bonuses reviews. Our audits and reviews are straightforward and. Our audits and reviews are straightforward and. Yallabet77 Casino is a smaller online casino revenue-wise.