IP reputation carries the most weight here
Unlike TikTok, where address type dominates, Meta appears to weigh the history attached to an address most heavily. An address previously used for bulk registration or spam brings that history with it.
This matters because reputation is not something you can fix by behaving well — it belongs to the address, not to you. The only remedy is to move to an address without that history, which is why checking a candidate exit before committing to it is worth the effort.