@J12t
I am not being argumentative, but I do not agree that #Fediverse is not a #Commons. This is true even after we exclude widely defederate instances. Instances run by Medium or BBC can not be expected to be Commons. We can only force at the interconnect interface. This is done by AP and enforced by defederation.

An individual joining an instance can attempt to enforce these guidelines by joining a coop. Other than I am not sure what more can be done.