Thanks for your feedback @meiunardhal.
It's true, top musicians are already well paid, but not through streaming and mainly with live gigs. Imagine if they didn't have to tour every year to make money and they could spend that time connecting with their fans, for example. Also, we'd like to help the artists that struggle (which is the vast majority) rather than the once that are already doing well.
Yes, Amazon and Google could, but we have a patent on that. So they'd have to pay us first :)