They were open to this option in 2017, but looks like it is still not available. Tidal has HiFi option for "Master Quality" uncompressed music, but it doesn't cover all albums - only “Master Quality Authenticated Albums”.
All about streaming
I'm an audiophile who's been through album, cd, and mp3 formats. I currently have a laptop hardwired via usb to my audio system and usually listen to mp3's purchased through Itunes. I recently subscribed to Spotify premium which is connected to my wifi network. I've noticed that when listening to the same material, the mp3's sound much better than the Spotify version. Would I get better sound from streaming via ethernet?