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Anyone can start a fork... There is a big difference between starting a fork and remaining on the original chain for us.
If the community forked we would have a problem with exchanges since his chain would be the original one. With the soft fork we dont.
Now if he forks the general sentiment would be:

Well Justin bought some Steem and the community froze it, now hes starting his own chain.

Let him. The exchanges wouldnt budge much in that case.

Of course he would have to convince exchanges to list his coin in that hypothetical case but I would not underestimate the potential to just simply buy his way (he has a deep enough pocket to do it). But I agree that it would be much more difficult.