As others have said, shitty is entirely subjective.
But pirated is a really easy problem to solve. Just run it through an identifier like Echoprint.
I strongly disagree that shitty is entirely subjective. Contextually, "shitty" could mean music recorded on a cell phone, or tracks that were 2 seconds long, or tracks that have been transcoded 7 times and sound like they're being played from a walkie-talkie at the bottom of a well.
I can understand why a music platform might want to enforce some standards of professionalism or technical competency, even if they didn't want to do so for matters of taste.
then came TuneCore which became the middle man to make it easy for both sides. this was great and empowering. but they have a big yearly fee.
it is possible to deal directly with Apple but its actually a significant value add to go through a middleman and reduce the labor and billing complications.