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You forgot about bandwidth costs. The entire benefit of a CDN is moving data closer to the user to not only speed up access time, but cut down on data transfer fees. So you can either replicate your entire database across all CDN nodes (and pay more for duplicated storage), or you can have cold storage in one location (and pay more for transferring the data).

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The thesis of deliberately deleting all these images would be premised on the idea that no one was accessing them anyways, hence they're useless. That merely storing (but seldom accessing) them is very cheap is a sufficient rejoinder to that thesis.

> The thesis of deliberately deleting all these images would be premised on the idea that no one was accessing them anyways

That doesn't make sense. The OP seems to be implying the exact opposite in fact.

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