...but customers being trained on “GCP's tooling, quirks, documentation” and not your competitors’ is. Also it extends beyond training, even cloud storage apis and tools are not drop-in compatible in clients and scripts.
You can also see this in healthcare with Epic. They use absolutely bizarre names for everything to the point that it is hard for organizations using Epic to talk to organizations using other EHRs, or for employees to move between them. And since they have an absolute stranglehold on training and documentation, you basically have to go through them to be indoctrinated.
Folks have a real fear of change and learning is viewed as difficult and/or annoying. This can create considerable inertia that you can exploit.
They aren't doing anything to block us from leaving, and anyone here thinking there is going to be some kind of 100% unified API between every cloud provider is out of touch with reality, if that is what their expectation of "no vendor lock-in" is.