In my opinion it is absolutely irresponsible that Steemit CEO Ned Scott reduces his voting power by 50% without making any announcement. Imagine, Elon Musk selling 50% of his Tesla stakes without any statement about it. Would you like to be invested in such a company? I certainly don't.
It is not the case that everyone who holds a larger stake is obliged to make a corresponding statement to sell his shares. But, as a CEO you have a certain responsibility, because you can cause panic and cause considerable damage to the company and its investors or in this case also to users.