A) You have to trust third parties.

B) It's boring to point out what Google has killed. But when you look at that list there's nothing as substantial as ChromeOS.

Finally, ChromeOS is incredibly widely used internally, and is a revenue generating product in the Chromebook family sold to enterprises alongside Cloud products. It is not an area where Google is going to capitulate or kill without a sufficiently long runway and carefully considered EOL plan.

Disclosure: am Googler. Am tired of half-considered takes on Google.