I don't see how. They only lose money on public anonymous pulls.
Docker's eventually going away and distros will replace it with a home grown alternative (or systemd). I predict that in 10 years distros will finally move toward a container native model (different from what we have now, but still based on containerization) and host their own registries for officially packaged containers. The same people that mirror their packages will host the registries. You'll add trusted registries the same way you add trusted package repos. In theory, this might actually reduce their overall bandwidth use.
Mindshare as THE go-to solution? They wanted to become Github for their space. While you can use private package registries, I suspect that's a 1% use case right now.
Docker's eventually going away and distros will replace it with a home grown alternative (or systemd). I predict that in 10 years distros will finally move toward a container native model (different from what we have now, but still based on containerization) and host their own registries for officially packaged containers. The same people that mirror their packages will host the registries. You'll add trusted registries the same way you add trusted package repos. In theory, this might actually reduce their overall bandwidth use.