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TikTok ran a deepfake ad of an AI MrBeast hawking iPhones for $2 — and it's the 'tip of the iceberg'
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
Here specifically it's a technique to alter images that makes them distorted for the "perception" by generative neural networks and unusable as training data but still recognizable to a human.
The general term is https://en.wikipedia.org/wiki/Adversarial_machine_learning#Data_poisoning
One example of a tool that does this is https://glaze.cs.uchicago.edu/ but I have doubts about its imperceptibility