Enshittification of music to be mass money making outlets through astroturfing music industries. It's easier to exploit and parade a Xanax addicted clout goblin named lil xxsixbaby who will pump out 30 recordings to the same backing track than it is to maintain a pop, rock, or rap group that wants their art to be long lasting and well crafted.
But people like them, no? Just to be clear, how people can enjoy autotuned mumbling about money and hookers is beyond me, but they are. Don't know about other genres, but in metal you still have a lot of bands that make complex and beautiful music (especially in symphonic metal), but not as many people listen to that, and often not because they don't know about alternatives. My own brother listens to mumble rap and other rappers that write lyrics that can be rearranged and you wouldn't notice because the only thing they do is rhyme, without building up to anything, and it's his choice, he likes listening to the same two songs in 50 variants.
It is very easy to find smaller bands that produce music with actual effort, and you can shove crappy music all you want to someone who doesn't like it, and it won't magically make them a fan, so the prevalence of autotuned simulations of strokes are due to people actually liking them, no?
I try not to judge these people too much because I myself often listen to extreme trve kvlt black metal which sounds like a vacuum cleaner to the uninitiated, so I tell myself that it's something like that. I never convince myself of that, but I try.
The same way punk rock got popular after Jimi Hendrix and a bunch of other people pushed the envelope in terms of technical musicianship, people wanted something new and the logical place to go was into making something simpler and more aggressive