Why do Tidal or Qobuz have hi resolution Music not available to download for purchase?


I've noticed that Tidal or Qobuz offer HD music to stream, yet the same song or album is not available to purchase and download in hi definition.  "Moondance" by Van Morrison is on Tidal as MQA or on Qobuz as an HD file.  I can't seem to find it to purchase and download in anything but CD quality.  How come?
aeschwartz