If you want, you can probably get into the hacked data and see my email warning them that by being a financial conduit they were not abiding by Safe Harbors with respect to the real rights owners.

It may not have "hosted" the music, but if you click on the music page, what do you see? Music videos. Then Patreon was the method to give those people money. People who may or may not have secured the proper licenses and paid the original artists.

Also, if I was an artist on the site, my personal information would be part of that dump - SSN, etc - so my reluctance to engage with them was prudent.

Edit: Downvoting my observations? I guess there are more people here that don't understand copyright than I figure, oh well.