Cheating wouldn't be the term I use, like myself for instance I have memorized the Splinterlands colection the cards abilities & what level they can be played at. Bronze is a little difficult to do this with basically reliant upon legendries. Gold rank 1 however with a level cap of 6 for common & rare cards have a very different play style.
Just a matter of sensing patterns through repetition, player psychology, given higher ranks rarely have bots to face. Could be viewed as skillset, or a advantage over other players IE an exploit.