I thought about it, but feared the "anti plagiarism" tools on one site or the other would "catch" that and flag it as plagiarism (assuming that there's no tool to "link" the account on steem with that on hive as belonging to the same person).
How would you go about it, practically speaking, prepare a draft in one front-end then copy-paste it in a different front-end (to the other blockchain) and click "publish" at about the same time on both ? Wouldn't that be frowned upon ?
About the number of users : I'm not referring statically to today's users (although even there, see below). I'm referring to what I expect to be a gradual increase in awareness about the existence of these platforms. As I used to write, Steemit.com is a "Schelling point" for "blockchain-based blogging".
When the overall buzz about everything "blockchain-based apps" will passively attract new users, new bloggers, chances are they will first think of and come to Steemit.com simply because it sounds familiar - they would have been hearing the name in the background for more than 5 years.
But even now, a pretty decent source is Alexa rankings. In Alexa, Steemit.com ranks 19664. The best ranking hive-based front, hive.blog, only ranks 28179 with peakd.com, leofinance.io and ecency.com further down.
In that respect, I would say that Hive has an even worse marketing problem than Steemit used to have.