I've done that. But it's ridiculous, as it takes me almost as long as writing it from scratch. But hey, if a client wants to pay me $125 an hour to edit that crap, I'll do it. But I don't see how they think this is a better or cheaper option than just hiring a decent writer, to begin with.
In my niche, the whole AI-generated content has died out a bit. 1.5 years ago (or whenever it was), everyone started using it. And the sites that did has since lost almost all traffic. One of my clients lost 97% of their traffic, so the site is now completely dead. Everyone seems to be back to human writing now, for which I'm grateful.