If you say old coins, I have plenty of them getting rotten in wallet wallet all together. 😂😂 Most of them usually from airdrop and bounty projects that had gone with the wind without even starting or running their projects for at least a year. Hopefully there are some entity or group that would filters incoming projects in order to avoid these kinds of waste projects in the future.
same thing happened to me many times - you register in airdrop, wait for updates, eventually coin is out there on exchanges (hopefully), and in some really rare cases you have a chance to sell 'em off fast enough so can grab your profit
most of the time there is no such opportunity