How does banning this account reduce spam? Removing it from the search results and unlinking its @handle in tweets from other accounts would have been enough,

How does banning this account reduce spam? Removing it from the search results and unlinking its @handle in tweets from other accounts would have been enough, if it was spam, to prevent it from being shown at all to anyone. If it’s useful for non-spam people who want to follow it from an offsite link, it’ll gain valid followers that can hint towards undoing its shadow ban over a long period of time — and by not doing follow activity of any sort in return, it’s clearly not playing the follow spam game in order to try and mask itself as anything other than a one-way feed account, so there’s no harm in letting active users follow it. It just reads like Twitter isn’t able to distinguish how it treats RSS feeds from how it treats spambots, due solely to a limited stable of technical reactions.