I don't know about "got bored of"; I'd say more "effectively deprecated, using increasing costs† as an implicit push toward rewriting your service for more modern parts of their platform."

Specifically, Google want you to rewrite your GAE apps for Cloud Run (https://cloud.google.com/appengine/migration-center/run/comp...):

> Cloud Run is the latest evolution of Google Cloud Serverless, building on the experience of running App Engine for more than a decade. Cloud Run runs on much of the same infrastructure as App Engine standard environment, so there are many similarities between these two platforms.

> Cloud Run is designed to improve upon the App Engine experience, incorporating many of the best features of both App Engine standard environment and App Engine flexible environment. Cloud Run services can handle the same workloads as App Engine services, but Cloud Run offers customers much more flexibility in implementing these services. This flexibility, along with improved integrations with both Google Cloud and third-party services, also enables Cloud Run to handle workloads that cannot run on App Engine.

Anyone who's still on GAE (rather than having moved over to Cloud Run) at this point is a "legacy enterprise customer"; and so Google have at this point moved GAE pricing beyond just a monetary disincentive to use, to being "fired-customer pricing" — i.e. the price you charge when you don't really want to work with a customer any more, a price that says "go away", but if they still want to pay you even at that price-point, then sure, why not?