Do these tokens have any use cases or they are just made to collect money from their fans ?
There are several thing that Fan Token creators
[https://www.socios.com/] describe in detail about Fan Token use cases. As far as I know, the token are tradable and some of them are still in the sale and development stage. The token also serves as a digital ticket to the beloved team to do some things.
Would they be used in gambling ?
Maybe it can be used as a mean of payment on some gaming platforms, but for gambling I don't know.