Doesn't make any sense to me! What is the source of your information?

If someone is earning through arbitrage what's the problem to exchange with that??? Arbitrage will either lead a rate increase for Steem & SBD at Bittrex or lead to rate decrease in Poloniex but ultimately market will level it up. How closing an exchange for a particular currency can help the matter? There are hundreds of exchanges with price differences in almost all coins. That means every exchange should shut down all their trading? Even as on today, Steem & SBD are disabled on Poloniex. And I read a 10 months old post from @timcliff when these were disabled too.

So this explanation isn't making any sense to me. Would you please explain in more detail or just point me to source of your knowledge. Thanks!