Some people use AI as they use anything else. Careless, without putting the effort in, making things somebody else's problem. This existed before AI, it just accelerated the stupidity.
The quick solution is to escalate the arms race, and start using AI to filter the AI slop, but I'm not sure that's a world I want to work in :)
If you think of it like filters, a human programmer does everything they know and test to avoid bugs, then the AI review catches some things that slip through to catch a larger total number of bugs. But if both sides are AI the same stuff slips through both stages and blows up on production. It makes more sense to just improve the models to make less mistakes than to have AI review itself.
So now, even figuring out that it was a careless or lazy job takes a lot more time, which drastically skews the economics in favor of the careless person.