Amazon and Tidal do Atmos, but their decoder is the one provided by Dolby. However It seems Dolby is trying to catch up on head tracking and HRTF. Apple is ahead here. Dolby is starting to pay attention to this segment of the consumer market.They do indeed, but only for Apple products of course.
I don't see any badge on Tidal to tell me whether a given album is Atmos encoded or not which is maddening. Also, I thought Atmos automatically converted to spatial audio when headphones were used as DTS:X does. I suppose it wouldn't know if you were using headphones or stereo speakers. Do Tidal or Amazon also have a spatial audio decoder, or is it just Apple?