I'm convinced that they specifically won't do that so that people won't use them to build competing products. Actions is one of the pieces that make GitHub money.
Almost every company I know of is in love with self hosted, or 3rd party, runners because they can't reason about OIDC auth into their cloud, or it's more evil sibling VPN
I'm open to your suggestion but I struggle to get onboard that Microsoft thinks that CI compute billing is the future
How do you figure that? I'd buy "lock people in the platform," but in that way GitHub Issues has been the moat for far longer than Actions has