Eh, the market is the reaper of wearables. There doesn't appear to be much of a market for non-Apple wearables (at least after the initial novelty wore off - tons of people bought fitbits and wore them for a couple weeks a few years ago). These companies are only being acquired because they failed to build a profitable market niche.

I think that Fitbit provided them an exit. Is anybody of those company still working for Fitbit? I doubt it...