[justicezyx]

Cloud run is developed by the same team that built AppEngine. They share the same technical leadership and a lot of the technical stacks, for example, billing and security (gVisor).

I dont think it's that simple to replace one service with another. It requires a lot of very sensitive dealing with external customers. And one cannot (easily) use the typical "Google deprecation" on a Cloud service offering, either.

So it's complicated. But your impression is not too far from the inclination.

[nojvek]

I’d imagine google would at-least make both appEngine run on the same core primitives that cloud run uses. So while the public facing api is the same, the internals are replaced. At-least that’s how I’d approach it. Deprecate app-engine in that it will be infinitely supported until the last customer, but all new stuff is advocated to be used on cloud run.