We already know that new artists do well from free distribution of their work. From Metallica back in the days of bootleg tapes of their gigs, to modern artists who get started on YouTube and social media. We already know that established acts aren't significantly harmed by piracy either, and this just confirms that in a high profile way.
Artists have always needed to give their music away for free. The money they get from radio play is a fraction of the pittance they get from CD sales, but it's an essential marketing tool. If they don't give it away for free no-one will hear it and no-one will buy it, simple as that.