What will COINBASE do with all the BITCA$H that they will be getting that they till their user they are not suporting?

I just wanted to know who is getting the Bitcash that is avalable to Bitcoin holders everywhere else.
Coinbase is hold a lot of Bitcoin for a lot of users.

Can anyone tell me if I have Bitcoin in a Coinbase acount will I get it.

THANKs For your help on this Matter.