STEEM is a very innovative packaging of relatively recent and very disruptive tech (as someone else pointed out, it's an ecosystem with Steemit just a component)- not quite as old a business as even the newest, most amazing candy-since it's candy.
That alone bespeaks much closer similarities to Musk's various projects, many of which can't be called the kind of commercial success Buffett's had for decades- but you only have to glance at SpaceX, the ancillary companies around Tesla, the Boring Co. (how boring is it?), and other projects to see how one person can actually lever history. You'll have to use a magnifying glass to figure out the impact Buffett will have had on Western civiulization in 20 years...
Focusing on building a moat on something that by design is heavily decentralized strikes me as nearly pointless, if not impossible. Sure, Steemit, Inc. can do that- and perhaps should, but I think it wouldn't protect the larger platform at all, nor would the corporation's demise result in the network's dissolution.