Those banns were not random banns, Im sure!
I hacked my whole life, legacy, items (not that high amount, only ~350 for BILLY, and for the other ones, maximum around 80), using Greenluma for Chapters / Exclusives (David / Feng)
Probably they checked since how long, do you play, how many hours, number of items, activity etc, they checked a lot of factors.
I have 1100 Hours and not banned. Probably they checked the number of reports. If you are a good player, you can wear legacy without doubt, but in other case...
So, all in all, these banns weren't random banns because I hacked my whole DBD profile, legacy, items, etc, but still could manage to ,, survive " the ban wave.
Greenluma is safe.