What do you mean? Running containers with docker is free as in beer, as well as docker itself being free as in speech. Do you mean docker desktop? Any reasonably proficient developer can install docker as cli only and doesn't even need the lousy electron app...
I mean AWS/GCP/Azure provide extremely good and cheep Docker compatible image registries; and also happen to have high margin products allowing you to run containers in their cloud.
The is no way Docker can compete if they only offer a image registry.
