Well, certainly, there are whales who curate good content on their own, but they have their own choice. There are many posts with good original content which do not get the attention, it deserves. So after some time, these authors also start using the bid bots, because that is the new standard of pushing your post and get notified.
And if you see the bot tracker page, then its having many bots. So certainly it looks like that is the most profitable business here now.