There is no such thing as a free token or coin.
You are required to do a task no matter how little it is.
Yes you do such thing like small tasks but its cost you nothing, its cost you no penny to have their tokens if its legitimate. I don't believe with airdrops but literally its a free way to have tokens. But the question is, how worthy are those tokens?
and 10% of them easily gets listed on exchanges.
I don't believe with this percentage, most of those tokens aren't even reaching the exchanges. I think its just around 5% and most of them are scam so most of the time you get nothing out of those small tasks.