Hi all, Spotify Staff here.
We don't have an offer for lossless playback. The absolutely best way to let Spotify know you would be interested in such a feature is to leave your vote and comments here: "HiFi Quality - Lossless Streaming 16bit 44.1khz"
I can assure you the feedback in the Idea Exchange is being passed on to the internal teams on a very regular basis. As soon as we have any updates on this we will post in that thread first.
Thank you for coming to the Spotify Community to give us your feedback. If you have any questions please post here.