An emulator for integration testing against the major cloud providers seems like it should:
1. be table-stakes for a SDK from the cloud providers themselves
2. have the obvious home in a foundation like the CNCF; how else could you be "cloud native" afterall?
ha. Cloud Native ≠ Native Cloud Services.
I always found it odd that the marketing successfully pivoted the term Cloud Native from meaning 'managed services consumed as APIs over the internet' to a generic umbrella for self-hosted versions of the cloud control planes and container management tooling.
That isn't a dig at the particular tools themselves - they just aren't... you know... cloud.