You all are incorrect.
Tidal is only CD quality at best
Spotify is below CD quality
Apples quality is generally CD quality or below
HD Tracks sells standard or lower quality music stuffed into hi-res containers and sold for a premium
Generally, the best way to get the highest quality audio files is from the record label that produces them. This comes with a caveat as most recordings are still either done on equipment that is below hi-res or only distributed in mastered form that is downgraded to standard or below resolution. Some examples of real high resolution music can be obtained from:
iTrax 2L - the Nordic Sound https://www.nativedsd.com/ Classical Music - Streaming Classical Music Blue Coast Records | Exceptional Acoustic Recordings http://www.bso.org/Merchandise/Listing