the Commune taking resources from outside

Resources they themselves were producing ? How is that other people's resources ? If you're talking about land/factories, it's the same thing: how does it not belong to those who build and work it ?

Internet services only work because everyone speaks the same language/protocols, which is only achievable with a large centralized authority, or with a network where peers do no trust each other (blockchain-style).

I see we are at odds at appreciating what people can do. There is no need for an authority to enforce anything: people do talk with each other. People can build trust in each other without an authority breathing down their neck, and without assuming everyone's against each other. Working with each other, for each other, works.