I can assure you that's not the case! Also, while people like to repeat this meme, Google Cloud does have a formal deprecation policy (https://cloud.google.com/terms/), whose intent is to give you some assurances.
(I work at Google, on GKE, though I am not a lawyer and thus don't work on the deprecation policy)
(I work at Google, on GKE, though I am not a lawyer and thus don't work on the deprecation policy)