App Engine caused a huge innovator's dilemma for Google when it came to cloud. It only addressed a set of use cases around web application development- Folks would ask "why shoudl we build a low-margin cloud?" and I'd tell people: "if I can't import numpy, App Engine is useless to me". Eventually, the useful bits of AE were extracted to other services with APIs (datastore is one example), but it wasn't until google built a full GCP that they started to see real cloud growth (revenue).

"Normal" is what most of us want.