For a network, one way to make for a good newcomer experience is to have a “ranked” experience where they are exposed to or interact with a subset of the entire graph. For example, a sub-reddit instead of everyone competing with everyone else on Reddit.
An MVC is the smallest action you can take to bring people together. An MVC is not necessarily a community, yet. It's not just throwing stuff out there and seeing what sticks. It's creating intentional community containers, that seek to create value and that are aligned with your vision.
Growing your tribe creates more resources that can allow you to reach higher goals. New people bring in new knowledge, new ideas, more attention, etc. At the same time, as the tribe grows it becomes increasingly harder to maintain highly trust-based group dynamics.