You can't meaningfully address that at a grassroots level because of the tragedy of the commons.
You have to engage with that problem at a higher level of organization. (National/Transnational).
Not really. You are correctly citing the enclosure acts as a historic example, but that was not beginning or the end of history. It was just a recent, location-specific historic moment when big English landlords won in the millenia-old power struggle between peasant and landlord.
Control of the commons - land and the resources buried in it - has been a point of contention and bloodshed for as long as recorded human history. It's a pendulum that swung back and forth, but has always had bad actors making personally-profitable, socially-impoverishing decisions.
For an alternative example of how things have gone in other places, look at the blood feuds between ranchers and farmers[1] in the American west, concerns over upstream and rainfall water rights in literally any part of the world that relies on irrigation, or, the varied situations where existing landlords politically won the struggle... Or lost it in the 20th century.
As for well-established[2]...
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[1] The enclosure acts echo this farmer/rancher dichotomy, actually. Feudal lord/serf relationships have the lords derive wealth from having ever more serfs doing ever more labour-intensive agriculture on their land. The enclosure acts, however, were intended to drive the peasants from their land, because in the case of England, the lords figured out that they can derive way more wealth from turning over their land to low-labour grazelands for sheep. And the way they could do that was to use the law as a cudgel to drive out their tenants at sword and gunpoint.
[2] They were only well-established for particular points in history. Prior to William the Conqueror arriving in England, and stealing all the land in it for himself and his mercenaries, there were also 'well-established' land use norms - that greatly limited the power and ownership-of-land granted to lords and petty kings. The Norman conquest turned all that over - into a different 'well-established' equilibrium - that was then, again, turned over into a 'well-established' equilibrium after the passage of the enclosure acts.
A few decent folks try to start up a great idea. More join. Some dont share the ideals.
More join, less ideals shared.
More join. Cool, free shit! (Not really, but this is when the commons is shit on and good will starts being lost.)
Group starts cracking at the scenes. Factions form. Badness sets in. Thefts spike. Abuse and vandalization of equipment is the norm.
I left my local makerspace for these above reasons. And I made my own. Cost more, but my equipment works and is right there.
But I'm happy to help, either by me going there or the friend bringing his stuff to my workshop.