The thing is they change/deprecate/retire paid-for services too (in a brutal contrast with the competiton).
Two quotes from one of the posts referenced in the submission (from Steve Yegge):
...I know I haven’t gone into a lot of specific details about GCP’s deprecations. I can tell you that virtually everything I’ve used, from networking (legacy to VPC) to storage (Cloud SQL v1 to v2) to Firebase (now Firestore with a totally different API) to App Engine (don’t even get me started) to Cloud Endpoints to… I dunno, everything, has forced me to rewrite it all after at most 2–3 years, and they never automate it for you, and often there is no documented migration path at all. It’s just crickets. And every time, I look over at AWS, and I ask myself what the fuck I’m still doing on GCP. ...
... Update 3, Aug 31 2020: A Google engineer in Cloud Marketplace who happens to be an old friend of mine contacted me to find out why C2D didn’t work, and we eventually figured out that it was because I had committed the sin of creating my network a few years ago, and C2D was failing for legacy networks due to a missing subnet parameter in their templates. I guess my advice to prospective GCP users is to make sure you know a lot of people at Google… ...
On the first, I've worked as a PM on Firebase, App Engine, and Endpoints.
Nobody has been forced to migrate from the Firebase RTDB to Firestore (and AFAICT the Firestore API hasn't deprecated anything?), App Engine deprecations (https://cloud.google.com/appengine/docs/deprecations) are basically "you can't do new things using these old things, but the old ones will continue to run" (though other deprecations I've done have provided clear explanations of why we're deprecating and how someone can work around it), and Endpoints is still around despite being comically out of date (it's even getting a managed version!).
Two quotes from one of the posts referenced in the submission (from Steve Yegge):
...I know I haven’t gone into a lot of specific details about GCP’s deprecations. I can tell you that virtually everything I’ve used, from networking (legacy to VPC) to storage (Cloud SQL v1 to v2) to Firebase (now Firestore with a totally different API) to App Engine (don’t even get me started) to Cloud Endpoints to… I dunno, everything, has forced me to rewrite it all after at most 2–3 years, and they never automate it for you, and often there is no documented migration path at all. It’s just crickets. And every time, I look over at AWS, and I ask myself what the fuck I’m still doing on GCP. ...
... Update 3, Aug 31 2020: A Google engineer in Cloud Marketplace who happens to be an old friend of mine contacted me to find out why C2D didn’t work, and we eventually figured out that it was because I had committed the sin of creating my network a few years ago, and C2D was failing for legacy networks due to a missing subnet parameter in their templates. I guess my advice to prospective GCP users is to make sure you know a lot of people at Google… ...