I've noticed a bunch of new follow requests in the past few months which are from accounts that have had no interactions with me: no comments, no likes, and no boosts for anything I've written.
I'm starting to suspect these accounts are bots rather than people who just follow and lurk quietly. There have been far too many new follow requests fitting this pattern lately and that makes me very suspicious.
Consequently, I'll be blocking any follow requests which fit this pattern from here on out.