But need a public license to operate which could be revoked unilaterally by a government

It seems you're entirely oblivious to the fundament difference between discussing property ownership and whether a space is opened to the public.

Don’t assume ignorance on my part. Words have meaning, and I think the distinction is important. There is a fundamental difference between regulating public spaces and private businesses, and we should treat that with the seriousness it’s due.

For what it’s worth, I think a mask order is reasonable.

Assumptions not required. Spaces open to the public does not equal Public spaces. Public spaces are necessarily spaces open to the public but spaces open to the public are not necessarily public spaces.

Also, think of a man as underwear for your face. You can strut around your house naked all you want, but you can't walk down the street that way, and I'm fairly certain the grocery store can't unilaterally decide to be a nudist friendly operation either. If the Venn diagram of places where you can be legally naked and places you can not wear a mask were basically the same, the original commenter' version of "everywhere" would be sufficiently met.