The issue is if these lists end up being blindly copied based on trust, and instances that don’t deserve to be banned end up being banned by dozens of instances just because they’re copying lists.

Something similar happened with Twitter banlists. A lot of the accounts were trolls and fascists and whatnot, but oftentimes someone with progressive views who is just a little controversial ends up on a banlist and banned by half of Twitter because one guy decided to stick him on a widely used banlist.