This was a long time ago and honestly I do not remember what I did. But I remember it was on a decentralized exchange and you would just put the coins to be sold, no talking.
Since it is a market and someone is falling for it to buy it, then it is just dead coins switching hands and someone else could have stupidly transacted a dead coin. It is a free world, an open market and everyone is auctioning what they have and I see nothing unethical there.
Anyone who is buying a coin and decided not to do some research before doing so, obviously should have themselves to blame. As long as you are not deceiving or imposing anything on anyone, I do not see anything bad there.