If the Fediverse takes off, it would be fair to expect that new mega corps would arise out of that success. At one point, Reddit was a scrappy startup. Before that, Facebook, Google, and even Microsoft were small companies that were going to change the world. Who knows which high user, high uptime instances will end up requiring full time staff, or which software tools will be used for interfacing with the Fediverse (or analyzing stats within the Fediverse), or otherwise make a profit out of all the activity that would be going on here?