Also you should always follow the social media channel of the coins you are investing or you hold so you are always updatex to what happening to thier project.
This is correct. I am not sure whether if the project got delisted what would happened on the tokens of the investors who maybe forgot to withdraw their tokens? Technically the exchange will remove their smart contract leaving the asset for that particular token gone or it will just be hanging around that? Im a bit confuse on that part. Whether the exchange could somehow help them recover that?
Maybe some are just busy to follow any social news on that project. Maybe dont be confident on holding altcoin even though they are listed on big exchange cause incident like this could persist.