Why this shape
What this buys
For the owner
The data never leaves their tenant. They can cut the estate's link to the provider in one action — revoking the instance key stops new software arriving — and keep running. Nothing about the estate lives in someone else's head.
For the provider
One platform, one chart, one registry — and no customer credential to safeguard.
For both
The estate is reproducible: a second region, a second environment or a full hand-over is the same pipeline with different parameters.