A possibility to game this kind of bots is to add a hidden link to a randomly generated page, which contain itself a link to another random page, and so one.: The bots will still consume resources but will be stuck parsing random garbage indefinitely.

I know there is a website that is doing that, but I forget his name.

Edit: This is not the one I had in mind, but I find https://www.fleiner.com/bots/ describes be a good honeypot.