Things to consider

Do I compete with ZeroHedge on Steem?

If ZeroHedge was to verify itself on Steem and post they would no doubt make 50x more than me and I'd me making close to nothing... because people would prefer to be supporting their editing work instead of my curation and formatting work.

If Steemit was better designed then maybe ZeroHedge could make a claim for the proper name @ZeroHedge
But that's not unusual for some people to have to use @TheReal... or some sort of prefix on twitter.

Is this more likely to trigger Zerohedge sue the steem blockchain (a preposterous concept) or it more likely that ZeroHedge will see a value in on-boarding steem?

I think the later is very unlikely because although most of the smart people are using an ad blockers Zerohedge is one of the most advertisement laden website and would for a long time to come be making a whole lot more money this way.