(Book Recommendation: "Official Wealth" by Leng Kuang. The title is unique and the content is excellent.)
...
Because of those bots, not only would they normal level up by fighting monsters, but they would also occasionally make in-game purchases, transferring the money from their bank accounts to Old Doyle's game company. Even the majority of the servers didn't have any real players. Because even those genuinely interested players were guided to the servers with more human players through registration and guidance.
Over time, to prevent real players from recognizing the machines, it seemed that every popular server was actually fake. The media, finance, and even government leaders were all kept in the dark. No wonder Old Doyle's company had a constant flow of wealth coming in, and the figures on the account were so good they were frightening.
