It depends on who makes them and when it is made. There is a period where the algo kicked in and the range from a particular seller gets whooped.
They put up a filter, not on the after it is added, but a particular date using a particular method. I don't know how much goes into their algo, but they're damn effective.
For instance, someone may create the accs on 1 domain, then the domain "expired" and he changed the email. All ig needed to do was trace how many accs that 1 domain created and put a filter, BAM.
Someone may also claim they have zero footprints, but hey, on android there are so many identifiers that it's almost imposible to make them all unique.
So yeah, the ones that are safe, are pretty rare. I got some batch that are ban heavy, and some that are fine, from the same seller.