Ah okay, I underestimated the effort on the side of exchange adoption when it comes to forks, as well as assumptions about how they would choose. I may also have wrongly assumed that Steemit Inc would have more influence on the exchanges themselves.
About the implicit contract, I see the distinction between the two groups, but I don't see that this is all that different from the relationship between Steemit management and Steemit shareholders, the relationship between Steemit management and Steem investors. Or say, the relationship within some hierarchy in terms of shareholders of some other large company.