Many on the bird app report substantial follower attrition; I, too, have experienced it.
Of course, to be honest, most of my follower-losses seem to be extraordinarily beautiful, God-fearing, inexplicably single young women who like to have fun, have a somewhat surprising interest in crypto-currency, and for whom grammar is not a high priority.
@NapsAndSarcasm I think that's a good strategy.
In my case, I kept them, in order to have a follower/followed ratio such that their algorithm permitted me to be able follow more people.
Moot now, of course.