Look at the accounts of OnlyFans models, crypto influencers, etc. They follow thousands or even tens of thousands of accounts in the hope that we will follow them in return.
Can you think of a use case?
All sorts of bots want this sort of access, but whether there are legitimate reasons to grant it to them on a non-sharded basis is another question since a lot of these queries do not scale resources with O(n) even on a centralized server architecture.
> Generally, this can be dealt with via policy and moderation to prevent abusive users from causing outsized load on systems, but these processes take time and can be imperfect.
So it’s a case of the engineers accepting that, however hard they try to moderate, these sorts of cases will crop up and they may as well design their infrastructure to handle them.
Bluesky doesn't have this problem yet because it's so young, so the outsized follow counts are mostly going to be from doomscrollers and outright malicious users, but even if it was exclusively malicious users, there is no perfect algorithm to identify them, much less do so before they start causing performance problems. Under those constraints, it makes sense to limit the potential blast radius and keep the site more usable for everyone.