This is a short cheatsheet to help you determine whether a release from Amazon, Hulu, or Netflix contains the lossless/untouched (as in no further loss of quality compared to what the streaming services provide) video/audio or not, since tagging is not always consistent and therefore it's an unreliable way to determine this alone.
In most cases, non-lossless rips from these services are screen captures (which, when done by professional releasers, should be high quality and contain little to no glitches – see the history section for details), but in some cases they may be simply reencoded from the untouched stream, for example to crop black bars or reencode from a higher-quality stream to achieve better quality. Also, generally the audio is untouched even when the video is not, but that's not always the case. There is no easy way to differentiate these cases, so I'm only describing what to look for in regards to lossless video streams, and for those, you can be quite certain