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That's why I ask, because I don't know if it's worth writing to both? And you have arguments for why it's worth in both?

Steem is likely to die, suddenly and without warning, continued writing increases how much you can get, if you dump, for tron stealing your history.
Hive is likely to persist, I think your history is safe there.

As long as the price holds, I wouldn't bet against either.

And, it's magic internet money that fedbook, twitter, Instagram, medium, and minds all keep for themselves.
Better to blog on steem, than fedbook, IMO.