I survived last BB. I've also played last FM and came out unschated. What I noticed from last FM, one of my throwaway account got flagged for this FM since I've faced obvious cheaters in my group (I know when I spot one). That account was rarely faced cheaters (from the way I observed) in many previous FMs and HPs. The only difference was, I bought something from last BB using hack (I didn't buy anything from any BBs, MM keys, wardrobe and always keep my energy below 600 all the time to experiment on this), then I got my account flagged. So I assume, if you're using hack when buying something in-game, you won't get banned, but your account will automatically get flagged. If you're get flagged, then you'll get sorted with more cheaters in FM and HP. I've read from another that buying too many pages got them banned, but I've hoarded many pages, creatures foods, bought all TLSQs and spells from Memory Book in another account (quite old) and still safe. Maybe they turned them pages immediately to books? Idk. Never tested it.