I have to wonder about the size of these markets. 99% of music listeners must be using Spotify or YouTube or Pandora or something that has a reasonable free tier, because they don’t really care that much about SQ – MP3 is just fine.
Of the rest – the 1 % – Apple music has an existing chunk, then TIDAL and Amazon HD and Qobuz split up the miniscule portion that’s left.
I’d maybe bet on Spotify long term. They have the contracts, the advertisers, the customers. If they see a shift towards hi-res, they can simply shift their system to accommodate it. Amazon has the money and the heft to muscle them, but does Amazon really care about this?