What might cause big mobile data consumption (when searching for new podcasts)

In the context of the following tweet:

When searching for podcasts and images are loaded, if a couple of podcasts have set ridiculously large cover images, could that lead to high data use?

What other things (apart from the user forgetting that they had temporarily allowed downloading of an episode over a mobile connection at some point in the day) might potentially cause this?

I think there was an issue at some point where a publisher added their huge mp3 file as the image

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