Software just doesn't give a shit about wasting space anymore.
I just now discovered that Podcast Addict on Android hangs onto every single thumbnail it ever comes across, in full quality, forever. By "comes across", I mean, even if you search for a show and other results pop up, or just browse through their storefront and see various thumbnails, it'll keep them all. Even tracks you've deleted. Here's my folder that dates back to mid 2018:
So for a wall of shame, here are the podcast images that weighed in at the biggest filesizes, with the top 7 clocking in at over 10mb each:
Fuck you, Doug Stanhope, and your 6mb thumbnails each.
The 18mb one has full EXIF data, too, with Jamie Vernon's name in it. Fuck you, Jamie, and your $900 (today) Canon EOS 60D.
And four are under 10kb, though for obvious reasons:



So if you use that app, now you know. They're stored at
Android\data\com.bambuna.podcastaddict\files\podcast\thumbnails.