The human part, turning it from slop to polished, becomes the most important part of the work, and then (and in any case) should be paid at human rates.
They can actually just hire the worst of you (who will do unpaid overtime, and let you call him a dummy when you're upset), because it's not a big deal that he's only 5x as fast as you used to be compared to your 10x as fast as you used to be. They can't even attract that much business now because the lowest end of the market completely disappeared and is doing it at home by themselves.
Prepress/typesetting work went from a highly-specialized job that you spent years mastering and could raise a family with to a still moderately difficult job that paid just above minimum wage within a single generation, just due to Photoshop, Illustrator, and InDesign. Those tools don't even generate anything resembling a final product, they just make the job digital instead of physical. In the case of copywriting, AI instantly generates something that a lazy person could ship with.
However, we live in a world where people have to compete to survive. Since a major portion of the task is automated, all of a sudden there are many available copywriting editors looking for work. The abundance tends to drive down the wage on sites like Fiverr.
And that's why unions are so important!
That is, if you're selling razor blades, you want the handle and the shaving cream to be cheap. Well then, if you're turning slop into polished, then you want the slop to be cheap. And AI makes it much cheaper.
"Gamblers generate slop, businessmen sell it as 'AI-powered.'"
Something important is missing.