I used to do Air drop and bounty. Get all coins in time when the market is down. The value of all these coins lost 90% even now looking at it I do not believe it is no longer valid.
I cannot sell them because no one buys them, and its value can only be enough to transfer to exchange.
So do you have a way to hide it or delete all the coins from your wallet?
I don't think there is a way to hide or eliminate these coins from the wallet. It is true that we often get tokens from bounty projects and then we see prices continue to fall and slowly become worthless which then makes us feel that these tokens are useless and better to throw them away, but I don't think there is a way to eliminate them if the tokens do not have value and not listed in the exchange so that the token ends up just becoming junk in our wallet.