

You most likely pay for a maximum CPU capacity and your Server cant go above that no matter what you run. Your vps provider doesn’t care what that CPU power is used for.
However with limited resources, the tarpit might use up all CPU power and the rest of the webserver will crawl to a halt.
Well if you operate a death machine it would be realy nice if you could follow the rules and not kill somebody. Of course the rules should be reasonable but being unable to follow them means you should not be operating a death machine