Because more sugar is being added, or rather created. In many fruits they first grow to full size filled with starch and then ripen through enzymes breaking the starch into sugar making it sweeter and weakening cell walls to make it softer. Ripening doesn’t stop because fruit is off the tree, everything required is already inside the fruit itself.
That’s not how it works in citrus fruits and most berries though, if those are picked too early they’ll stay bad.
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