It would have been far better to quietly sell these BTC evenly spread across the major exchanges at market prices.
If you have a plan to get 98% of the value of these Bitcoins and think that someone else will only get 70%, then dig through your couch cushions to raise 15 million bucks and outbid the other guy.
These are totally normal market mechanisms.
It would have been far better to quietly sell these BTC evenly spread across the major exchanges at market prices.