Of course I wouldn't vibe code in a serious production project, but I'd
  still use an AI agent, except I'd make sure I understand every line it
  puts out.

So you value your ability to churn out insignificant dreck over the ability of others to use the internet? Because that's the choice you're making. All of the sites that churn your browser for a few seconds because they're trying to block AI DDoS bots, that's worth your convenience on meaningless projects? The increased blast radius of Cloudflare outages, that's a cost with foisting on to the rest of the internet for your convenience?

Thanks.