Well, AM has always meant AM, lol.
Surely that's not what somebody would mean?
OMG... Yeah, people are going to have to be extremely careful here. Maybe we're gonna have to go back to calling them iTunes and Prime.
Oh wow. Yeah. Um, so we've just been off on a big tangent.
In any case, streaming barely does an adequate job with stereo music. There's really no point in trying anything multichannel. Especially not when there's a phone or headphones involved. In both cases the whole point of Atmos is completely destroyed.
If Dolby really cared about sound quality, they'd make it so Atmos was not available on any streaming service and not available via headphones or any other stereo device. But of course they're more interested in getting paid for "subscriptions", so they water down the quality of their format. :-(