They're not short-sighted; there's science behind it. The science of getting people to waste as much time as possible generating "engagement". All of this is A/B tested to hell and people's careers live and die by it.
Yes, maybe shortsighted is not the right word, but regardless, they misunderstand signal constantly.
I go out of my way to block accounts that post stuff I don't want in my feed and pretty much all of them see that as an invitation to give me more of the same content. Likely because I "interact" longer with the content since it takes clicks to block the account.