The trouble is still differentiating between real users and agents. Sure this could be useful (forcing agents to spend a certain amount of compute towards something actually useful), however real users that get stuck with it would be stuck for an even greater length of time, because the compute required to actually do something useful is beyond the reach of most consumer devices. An rtx pro 6000 costs .76$ per hour for renting, so quite a lot of compute needs to be done for it to be considered "worth it" for the website