I trust online dealing of the cards is fair . I dont trust the opponents in any games where you the buyin or entry fee is more that say, $50 (ring games ,sngs, etc ).There are just too many ways to communicate almost instantly about your holding and team up somehow .And i dont trust bigger MTTs either since some sites still allow data tracking software , and its not hard to access powerful programs that spit out, actions ,bet sizes, and other suggestions in real time . Even in live tournaments , i understand you are allowed to get up from the table between hands and look at your phone , where you could have chart after chart ready with things like push /fold info as the stacks sizes changed .Memorizing that much is almost impossible for most of us , but someone tech savvy can almost instantly have access to all of it online or live .