You may not, but plenty of people do. Especially the kind of music fans who use Bandcamp.
To me, music isn't just about "this sounds nice, it doesn't bother me, can put that on in the background". I get *really* into the music and artists I like, and I care about what they have to say, where they come from, the life experiences they put into their music or lyrics. GenAI has, by definition, nothing to say.
It's not about whether one is able to tell the difference or not. It's possible that I could fall for a fake news article, but you better believe I'll feel betrayed and be dann pissed at whoever published that article. It's not, "oh well, as long as I couldn't tell the difference, it doesn't matter." I don't read the news just for the purpose of it sounding plausible, and in the same way I don't listen to music just for the purpose of it being pleasant on the ears. The truth matters. The artists behind the music matter.