It is the more tightly-knit group of people who know and trust one another to act in the best interests of community survival that constitute the community, even though the larger community gains some benefit from their endeavors. Recent popular efforts to gather interested people together to form community solely for the sake of experiencing community are bound to fail. If such a community survives, it's because members have found some common purpose for banding together. Or, you may find professional support for continuing expanding your skills. You might also find these in a more traditional membership organization.
Community is just one of the ways people can organize to achieve common ends.
Balancing the complex demands of multiple claimants can serve as the purpose for a community. There need to be rules that moderate and govern behavior in the community. And, because rules without penalties are meaningless, there is need for graduated penalties that can be applied by some authority. Rules, whether written down, explicitly shared or an implicit part of the culture, will always exist. In a sense of fair play, most communities try to document some minimal set of guidelines to behavior for the benefit of new members, and to serve as reference in the future.