It is very difficult to detect which tokens will be listed, from airdrops or bounties. because the name rewards is a matter of luck, sometimes we hope to get valuable tokens but the price dumps badly after listing. Honestly, I have received many rewards in the past by participating in bounties and airdrops.
Detect or analyze?
The tokens got from airdrops and bounties are mostly from new projects. There is surely no guarantee for the tokens to be listed on exchanges. Many of them are just scam tokens/coins because there is development of the projects and the teams never list the tokens/coins. Yep, some of them can be listed but the price keep decreasing after it is listed on the exchanges. It is because most investors and hunters sell their coins/tokens.
I agree with you there. Some people hold them till the end no matter what, and they sometimes profit from it - but most of the people hit the button and get rid of their drops immediately. Especially if they don't hold much of the tokens anyways.
Most of the time, coins from new projects are rarely kept in the hope that they will increase when there is a movement of bitcoin, but now, when they receive them, they immediately sell them and don't expect to be able to wait for them to increase, and they don't believe in it.
Rarely does anyone speculate about keeping them, but I agree with your opinion. If the coins obtained are quite a lot, then usually some are kept seeking fortune, so that if there is an increase, they will also get it.