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Tidal is still very much streaming, in lossless stereo as well as in Atmos. But not lossless Atmos- nobody does that. And the native Tidal app used to be limited to 320 kpbs, though with the 2.9 update on Air there is the option to play "up to lossless" that wasn't there before, would need to be tested to see if it's actually streaming in lossless which I doubt it is.
There is no service that streams lossless Atmos (Dolby TrueHD), including Netflix/Apple TV video services. A lossless stream runs be 6,000-8,000 kbps versus Tidal's lossy Atmos streams that average 768 kpbs - that's generally not sustainable over a mobile connection and even if it were, the mobile companies would revolt.
