For paid apps and games, you can continue to use them for some time before you have to buy the app outside of your Play Pass subscription.
Google says that free apps and games will remain accessible but you will start to see ads again and be asked to pay for in-app items. In the case where an app developer has decided to remove their apps or game from the Play Pass subscription service, similar rules apply. What happens if an app developer pulls their app from Play Pass? So just because you've stopped using Play Pass apps and games does not change anything with your Play Pass subscription and you should expect an automatic renewal at the end of the month. You will still be charged a monthly fee until you go into settings and cancel your subscription. It's also worth noting that even if you uninstall all the Play Pass apps and games from your phone, that does not cancel or pause your subscription.