@dansup @pixelfed follow and like bots are a lot easier to detect then it seems.
They have usually one of 2 purposes.

1. gather followers for selling it later

2. execute the Spam via Name, Description or pinned post.

The first group is not very much annoying for most, as many do not realize its spam.
The second is easy to detect, because the spam and especially the url is following an easy detectable pattern