Heck, this is the market doing its thing, isn't it? You can't say you want capitalism and then complain because the market demonstrates as much demand for the sound of rain falling on a roof as for a particular singer-songwriter. I think WMG is just annoyed the person who uploaded the rain noise doesn't have to pay royalties to the rain and keeps the entire cut.

I'm sure WMG also thinks WMG's contribution to Ed Sheeran's music on the platform is worth the millions they get paid as middlemen. At least the rain is contributing something by making a noise.