The solution is to deploy new Nest firmware on the Revolv hardware, not axe your customer base. Then you at least get to exchange the loss of features with entree into the current Nest ecosystem. The message now is that all Alphabet supported hardware can't be trusted. Ha ha sucker. You just blew $300 on a fancy doorstop.
Yes, I can't help to compare this to what happened with Parse. They are shutting down but they released the backend as open source and customers could keep going on.
I think that companies should be more careful at offering "lifetime subscriptions" or similar stuff. You shouldn't be allowed to take back that. Can the people in their boards be sued for damages even if the company closes? I don't know about the USA but in other countries board members are personally responsible in some cases, for example frauds.