Good point. You're right that centralization is another challenge. Brave managed it, so as long as it's managed by a reputable business, it would probably be OK, but I wonder if it could be decentralized with the use of some sort of a wrapped STEEM token and an oracle like justlink. I'm not familiar enough with oracles to really have any idea bout that.

Along the lines of your idea of burning rewards, we once had a Share n burn community, but it never really took off, and it totally died after all the drama in March or whenever it was. In addition to sharing links here, it would be good if there was also some way to complete a handshake by letting the original author know that their content had been shared.