FYI there're gazillion of web stream services and all of them got the same source/supplier http://label-worx.com/stores/ , the only difference are settings lossy ones use to encode into mp3. If there's a difference between these "pre-encodes" vs. lossless-->mp3 "manual" encodes then it's really negligible.
As for those exclusive previews/radio edits showing up only at (some?) streaming services long before official release - that's kinda new practice that started like half a year ago and only for few releases. Probably a boon for those who treats these cuts (even with proper/non-upscaled spectrums) as complete releases, probably a pain in the ass for scene groups (like HB/MMS) who got an itch to release just everything related to their genres of focus and asap. Anyway, if such "pre-release" is available at such well-known services as Deezer and is rippable in the same way as the other "regular" releases then I don't see why it should be treated in any way special/different.
Google Play rips are tolerated, because they are quality and there is no differences between rip and bought stuff from this service. Each Deezer track is based on official releases in music webstores. I haven't found spectre/sound difference between music from Deezer and Google Play, but Proximus noticed that Deezer uses another encoder (link). If GP rips are considered as good, why Deezer rips don't have classified as that?
Anyway, appeared right suspicions that stream exclusive edits such as Reverze Anthem, Roughstate tracks can be different from official Edits/Radio Edits. One user on 1gabba asked me about 3 newest Roughstate edits to rip (link). I noticed that one of these song is already released on Digital Punk album (link). Deezer 'edit' from upcoming release is longer by 2 seconds. It can partially dispel this statement, but we'll see when these tracks will be finaly released.