Deeply relying on any service provider for anything puts you in a very vulnerable position regardless of how excellent that provider is. Things change, company priorities shift, companies get acquired by other companies, go out of business, etc. Current performance is not a guarantee of future performance.

Sometimes, you have to accept that vulnerability. I have exactly one option for getting electrical service, for example. But in general, people should avoid this sort of arrangement to the greatest degree possible.

Especially for something where there are tons of other options, like home automation.