CSAM sourcing?

Where do these people get that much CSAM. somebody once said that to the best of their understanding, it was new CSAM images each time, meaning not many repeats. My collection of reddit memes costs me ~15-30GB, all of sbubby costs ~5GB. where is it pooled from?

The most fried part of my brain says “One of the big companies trying to absorb the fediverse is doing this to undermine their competition,” but I have zero evidence

Most companies that build CSAM detectors, by nature of the work they have a lot of it. likely thousands of photos and videos. There may have been a leak from a CSAM vault wether it was intentional or not.

it’s just the only motive I can even think of beyond it being a rogue crank.

Its not hard to build a bot that scrapes a webpage of its images, they can easly aggrogate that much content over decades.