After 2 times get banned, here's what I think they do to know if you are cheating or not: "Gold" + report from others ofc...
They detect your gold, if it reach an abnormal amount, it's game over... So be aware when you use gold related cheat.
The scroll also a bad news, dont use it too much, but better to not using them.
Fairy cheat is still good, but since it's written on the stat how much you open fairy chest, it's better not use them too much.