For what reason would insects grow in size over a long evolutionary period?

What possible evolutionary reasons would there be for insects to increase their physical size over a long period? What benefits would be gained by an insect being larger? For example, say ants increases in size from today's size to the size of a football.

_{There is another question that asks can insects evolve to increase in size. I am asking for reasons why they would.}

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For what reason would insects grow in size over a long evolutionary period?

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