The crucial difference is who defines and controls that “contribution.” Voluntary cooperation will never be a “tax.”

When I talk about taxes as something satanic, I mean a coercive system where a central authority takes what's yours by force, under threat and punishment, even if you never asked for its “services.” That's not cooperation. That's institutionalized violence.

Commons can exist perfectly well without coercion. Common property can be managed by free agreements, private pacts, nodes, local communities.

The energy, storage, or maintenance costs you mention are voluntarily borne by those who participate. No one points a gun at you to make you run a node.

Taxes don't work that way. They're not optional. You can't say "I don't want to" without losing freedom or property.