Prevent the bloated official UnityHub from launching automatically?

I suspect this may be something that can't be controlled, but I find that what happens is:

* I launch UnityHubNative on Mac and it's deliciously fast. I tell it to open my project.
* My project launches correctly in Unity, hooray!
* But then the official UnityHub opens automatically too 😫

I guess this is something on the Unity side, I don't suppose there is anything we can do to prevent it? (I guess I could just delete it! But I'd like to keep it around just in case...)

Reproduce the reported flow by launching UnityHubNative on macOS and opening a project. Investigate whether the official UnityHub launch is triggered by Unity or by UnityHubNative; done means preventing that launch if it is controllable, or documenting the platform limitation if it is not.

Written by the indexing model from the issue text.