I don't understand. Are you claiming that the first 150k users that signed up are all real and that since the rate of growth has increased exponentially that it couldn't possibly be real users signing up? I don't dispute that some of it is bots for sure. There are clearly places that have 20k users and 2 posts and stuff like that that are very suspicious. But I don't think it's at all reasonable to assert that all of the growth that has occurred are bots. There is absolutely no evidence to suggest that. In fact, I would argue that the amount of activity (posts and comments) increasing alongside the user count is evidence to the contrary. I understand that bots can make posts too, but apart from the obviously labelled bots that are reposting content from reddit and stuff like that, I haven't seen any bot spam accounts posting links to suspicious sites or anything like that at all. Unless you're claiming that the bots are posting normal looking comments so that people think they are human? I don't understand.