[WorldMaker]

A lot of it seems to be the vastly different quality of documentation and support based on programming language. Where AWS seems low level enough it doesn't matter what language you write your software in, and Azure has made "bring your software no matter what language you write it in" a very explicit message even in its high level cloud offerings, Google gives the strong impression/ego that there are "right languages" and "wrong languages" and they aren't going to support you well (or possibly at all) in the "wrong languages".

Some of that impression is leftover from the way App Engine handled things and the first impression that left, but even GCP documentation itself still seems to struggle outside of "Google approved" languages.

Disclaimer: I interviewed with GCP as a .NET developer with a lot of experience in .NET to try to improve the situation. I got a lot of nasty ego directed at me that interviewers didn't trust my technical expertise because it was in such a "gross" stack and didn't know how to interview me technically. I personally saw that as direct evidence for why I'd never use GCP.