i think Maybe they check all acc logs Sequentially. that mean every used cheat account will get banned soon.
so go to used just enemy dumb mod. i think only use dumb is safe because many ppl used enemy dumb bugs(no mod) and ESC control bugs so nikke can't ban that ppl easily.
doesn't matter what list in rank or not. my sub acc is got banned in 3rd wave. only slow push normal story and no rank no freind no rank but it banned.
cleared 16-28 acc is still alive but i think someday it get banned.