On one hand I agree, it is perplexing. But then I realize that profile with a picture of a hot girl with lots of "friends" counts as a user that brings "engagem

On one hand I agree, it is perplexing. But then I realize that profile with a picture of a hot girl with lots of "friends" counts as a user that brings "engagement on the platform" so it's valuable to FB when they're trying to convince shareholders that the platform isn't dying. They're specifically incentivized to ignore those accounts and let them persist.