There are so many coins, but many of them just a copy of anothers. Why they waste their time for nothing?

They do this because it can be made in this new token, and that doesn't need a reason to make tokens. People are sometimes weird, they don't think about whether it will be bad or not when they pump the token. The price of the token will rise, so it's up to us to determine whether the token has value or not. Because in the end the choice will always be in our hands.