If you like playing games instead of doing more productive things while you commute (or pretend to be working), there's a game called Rage of Bahamut. It's ad free and it's certainly not a 'must' to spend money there.
In case you choose to give it a try, please use this referral code at the end of the tutorial to get some bonuses (and send some my way as well): njl57860
In case you choose to give it a try, please use this referral code at the end of the tutorial to get some bonuses (and send some my way as well): njl57860