Why? Unless you’re speaking of bit-torent-style downloads. In which case, your reaction is entirely understandable.
People stream now and don’t download nearly as much. Most people have interenet connected devices. It’s entirely plausible. Especially if it pushes revenue towards a (more profitible?) streaming service. Music is not an industry that I’d want to be in though - in any capacity.
I have tried streaming at home and was left with an overwhelming "meh". I will never stream music (or anything else) with my iPhone because there is no way I am running the risk of going over my data allotment.