When you register, Twitter/X asks you to follow a popular account. He is one of then. The problem is that maybe those accounts are used once to see Twitter content and then forgotten. They could be used to login in a different website. I don't doubt that he has many bots following him, but inactive bots are useless.
Because life doesn't have a goal. There is no waste. That's a point of view that makes people suffer needlessly. The objectives of a cow in a meadow are to eat grass, sleep, defecate and socialize a little. Many living things have even fewer requirements. They might have survival and reproduction in common, but if they don't meet them, they haven't lost either. For some humans, this may be depressing, but it would be if their perspective* has led them to reason that.
*Their perspective and their context, because we are social animals and we do not live isolated from other people's requests.