[MichaelApproved]

That's why I specifically said "made by a single company", not "made for a single company". Products using the Nest API were "made for".

[2Ccltvcm]

Irrelevant because you will always get screwed unless the company has a huge track record in backwards compatibility and very conservative slow changing management.

Get open source hardware and software that you can maintain yourself or suck it up and cough up the dough.