Exactly. Imagine needing to pay a penny for every request. Not a huge deal for someone who only makes one or two requests per year. But if you’re running a bot farm and making tens of millions of requests per day, you’ll quickly find that your operating costs have skyrocketed. That’s basically the idea behind Anubis; Make someone pay in CPU time, so the legit users don’t really notice but bots quickly eat up all of their servers’ CPU.