After a super big lose of 94% i moved my coins from poloniex to cryptopia. My question is If someone leave DNotes on exchange will they be swapped automatically or what?
That depends on each individual exchange and what their policies are. You can always open a free account at the DNotesVault and move your coins there. Or download the DNotes wallet. Those will be swapped automatically.
I would recommend against leaving coins on any exchange long term if you aren't actively trading them.