The principle of "the commons" has been interpreted and applied in many ways; concretely, abstractly, and metaphorically. Anything shared "in common" can be considered as "a commons".
In the social-recreational dance industry, I see the issues of "quality" and "bad behavior" as very important elements of the commons of social-recreational dance.
The principle of the commons begins with "the tragedy of the commons"; which in general can be interpreted as the observation that a commons is used by many, will be abused by some, and eventually can be diminished or even ruined for all. The "environment" (of pretty much anything) is an example of a commons.
The principle of the commons is that, to avoid the tragedy, some attempt must be made to reduce abuse, or overuse, of the commons.
In any industry or profession, matters of "the commons" are a key reason for the initiation, development, support and sustenance of industry/trade associations, professional associations, credentialing, and professionalization.