I somehow lost over 100 followers on both Threads and Bluesky overnight. My leading theory is that all the political bots, having completed their mission, have self-destructed.
They will probably return four years from now. Like cicadas emerging from the Earth, if instead of making loud buzzing sounds, cicadas spread Russian disinformation to all of your relatives.
I doubt the accounts would delete themselves though, that would be too easy to identify them.
Keep in mind on both those platforms that is a natural pattern. When i get a lot of followers in one day it always rebounds shortly after.