Bots are the best thing to have happened to Twitter's bottom line. Essentially Twitter at a fundamental level operates by farming the users into nice sorted silos. Then waiting for something to enrage a silo enough for them to obsessively engage with something in a dopamine addiction reaction. Bots are amazingly effective at finding enrage points, and fertilizing what would otherwise be fallow fields. Bots are just a cost effective way of finding the right fertilizer, field, and silo (and all government subsidized on top of it).