[danbruc]

Sure, everyone can follow everyone, 8 billion people can each have 8 billion followers, but that also means that everyone can spend about 4 milliseconds per year on each one they are following. What really matters is the time and money you are spending and that is essentially a fixed amount which you can split into a few larger or many smaller contributions. If there are many evenly spread small contributions, then no one can make a living on that, if there are a few big and concentrated contributions, then only a few can make a living.