I understand but i mainly reffer also to MTGox and other exchanges that turn into scam after time. If we use decentralized exchanges this will change or they still can hold our coins?
We can save our coins in the exchange even though the exchange makes changes in any form, the only problem is the desire of the exchange party, if the exchange wants to deceive their users, then whatever we do still will not mean anything, the point is back again to the wishes of the team exchange itself.