why not just approve the PRs with little more than a cursory glance?
One of two things will happen:
1. Things start breaking, proving AI generated code sucks and the individual spamming these PRs is incompetent.
2. The code works fine and reviews are unnecessary for anything other than liability concerns.
Because we're all on call for the service, and tragedy of the commons exists. That coworker isn't paying the cost, everyone else is paying a fraction of it, and it builds over time.
Some of us actually take the "engineering" in "software engineering" seriously.
That includes taking responsibility and accountability so that the software doesn't become a sad and dangerous mess.
If we want to be an engineering discipline, just yoloing in production is not going to cut it.