Basically, the amount of wRING doesn’t increase over time, but its value does. Your $RING balance will increase every 15 minutes thanks to the automatic rebases. However, unlike your $RING balance, your wRING balance will not increase over time, but its value will. When wRING is unwrapped, you receive an amount of $RING based on the latest value of the ever-increasing index, so the total yield is the same. That means your wRING is compounding at the same exact rate as $RING thanks to some clever mathematics