I dunno if they publish like a 10 TB torrent of the most popular music I can see people making their own music services. A 10 TB hard disk is easily affordable, and that's about 3 million songs which is way more than anyone could listen to in a lifetime, even if you reduce that by 100x to account for taste.
It's probably going to make the AI music generation problem worse anyway...
I would expect more data to make ai music generation better
The problem isn't the generation, it's the taste of the generators.
An earnest young lady with a guitar can already sing a light jazz version of 'Highway to Hell' or whatever. Just go to your local cafe to hear it. The objective quality is terrific.
In the past, this wouldn't have been made because the end result is subjectively banal. But now people with no taste can churn it out by the thousands of hours for free.
When they say "worse" they do mean the AI will get better which will be worse because they are ideologically opposed to AI.
I'm not ideologically opposed to AI. The problem will get worse because while the quality of the music will improve, it will still be bad and there will also be a lot more of it.
We aren't really short on music. Diluting the good stuff with 100x more mediocre filler is not a good thing.
If AI generated music ever actually becomes good then that's another story but that is quite a way off.