My guess is, as with Samsung Notes and the cloud photo solution, Samsung are slowly moving away from offering their own cloud services. They'll probably suggest people switch to Google Fit since Google bought Fitbit.
I never thought Nest was a good product to begin with (horrifically overpriced for what it does) but that's a different conversation.
I don't think Google have much of a choice to create a good fitness ecosystem given Apple's offerings. But then again they were in a similar situation vs. iMessage and not only did they take forever to come up with RCS and Google Messages but the latter is now very poorly maintained. *sigh*