Hell, look at the video games from the 1980s. Download the scans of any early gaming magazine or a MAME ROM archive. At least 50% of the games were derivative slop. Crappy movies and books were around for a 100 years too.
Volume matters lol..
This is worse for new entrants than either established developers or consumers, who will have to work harder to get their work recognized amidst the rising tide of slop.
Perhaps some conventions will develop similar to what I've seen on a smaller scale for fan artists releasing work online, where developers will provide some evidence of their development work in process to convince (human or AI) slop filters to let them pass.
Point is that you can't ignore well marketed slop. It will show up everywhere. Volume of slop matters because that drags down the median quality so that it becomes feasible to market slop and get returns on it.