That's normal progression. Hardly anyone at Microsoft used Azure in the beginning either, it takes a few years for teams to move infra and deprecate old stuff.
Same for Amazon, it took them very long also, including dedicated internal projects with focus on moving. But majority of Amazon and Microsoft workloads now run on their respective cloud offerings.
Google is probably still be at least 3-5 years before that would happen be aligned. GCP is quite immature and young, which this leak highlights also. I assume this would mean that also internal teams at Google won't be moving workloads to GCP.
Same for Amazon, it took them very long also, including dedicated internal projects with focus on moving. But majority of Amazon and Microsoft workloads now run on their respective cloud offerings.
Google is probably still be at least 3-5 years before that would happen be aligned. GCP is quite immature and young, which this leak highlights also. I assume this would mean that also internal teams at Google won't be moving workloads to GCP.