Hate raid follow bots
The current wave of harassment bots mass generate accounts seconds before they follow, typically making accounts and following sequentially so that their usernames read out as a torrent of abuse.
It is clear that automation is used to create these accounts and command them to follow. It should not be possible to create accounts with automation.
Therefore do the following things:
Implement recapture or other real human authentication method for account creation.
IP block for account creation on the same IP within an hour.
Introduce a feature to Shield Mode that prevents unverified accounts from being able to follow at all.