I looked at that article, but I’d want to see some footnotes before taking it as gospel. It does not seem particularly unbiased. In any case, AFAICT, Beethoven did most of his composing (at least the composition of most of the works we ever hear) after his father’s death in 1792. So it’s hard to see how listening to his music would have anything to do with sweatshop labor. But regardless of that:
Listening to music composed by someone already dead cannot cause anything that happened in his life.
There is no systematic abuse of children to turn them into composers, so this isn’t supporting an immoral system.
If Beethoven’s father was abusive, buying Beethoven’s compositions cannot provide him with any benefit, as he has been dead for over 200 years.
You can’t beat musical (or any other sort of) talent into someone. Literally or figuratively.
The reason not to buy sweatshop clothing (or whatever) isn’t that the clothing itself is somehow tainted, but because it provides money to the people running the sweatshop. If it weren’t that it helps continue the sweatshop system and rewards people who treat their workers badly, there would be no reason not to buy it. How would it make the sweatshop workers feel better if not only were they forced to work for a tiny wage, but also everything they produced was a waste?
Besides that, if it were sinful to listen to Beethoven’s music, don’t you think someone would have mentioned it before now? I mean, you’d have heard at least a suggestion of it somewhere. There isn’t a stash of secret sins out there waiting to trap the unwary.