It said right in your quote that people do work that "no one volunteers to do". If they aren't volunteering, then *something* is providing the impetus. Broadly the writing avoids the more difficult nuance of *how* the community gets unplesant work to be "shared" when no one volunteers. This suggests enforcement one way or another. At small scale of a commune, some pretty human interactions can probably serve to drive this in a pretty reasonable way, by instilling sense of duty and comradery and potentially shame inherent to everyone knowing everyone else in a nuanced way. As you scale up, when inevitably people start losing track of each other, those soft mechanisms deteriorate, and the systems start to develop cracks for exploitation. Capitalism breaks in some ways, other systems break down in others. Fundamentally human behavior when interaction becomes diluted at scale tends to suck.