Downscaling/downsampling attack.

Commonly used against AI systems either to pass filters or poison data.

https://arxiv.org/abs/2010.02456

If you know the sampling rate of the sampling filter you want to pass you can do some tricky encoding to show a different image at that particular resolution bypassing AI/content recognition systems. This said if it starts happening a lot Google will take those images/videos and feed them into a learning system that looks for those patterns and preemptively marks the video.

I do a cryptic crossword from a free UK newspaper most days, because my Dad (many thousands of miles away), also does the same crossword and we can bond over good and bad clues, and so on.

The banner ad on that page is always Temu. It always, always looks pornographic. And then you look closer, and it's completely innocuous.

I have assumed that the alogrithm is just optimising for attention, and it just so happens those images, at that scale, are going to get a lot of attention. But it does mean I can't show somebody else the crossword I'm doing for fear of looking like a degenerate pervert, and I am at risk of causing an issue if I play it on public transport.