They can also launch a crypto-currency trading desk as well, why not.
This might be the next big step that they will do. Aside from being an exchange, they've given an ease to their users that don't want to try any other exchange or those first timers that are still in doubt of crypto.
They just made their lives easier. Having them launching their own token could also be big for them and will generate them profits. The first benefit that token would be is to give discount in fees just like other exchanges who own native tokens.