As mentioned above, it is possible that some virtual casinos will have slots with adjusted RTPs. You cannot base your choice of high-paying casinos simply on the providers that have powered the games at the respective online casino. The best way to determine whether you will be offered the optimal RTP rates is to do your own research. Make sure to read reviews of popular games to learn their optimal RTP rates and compare the percentage the online casino of your choice is offering. If you have found a virtual casino that is offering slots with optimal potential returns, you can trust the brand.