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>I don't think Google or OpenAI use SynthID to include personal data.

Why? I assume by default they are uniquely identifiable, because it just makes sense for them (tracking misuse at the very least), it's trivial to implement and trivial to hide or plausibly deny.

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Come on man, they're both advertising companies. Would you resist the opportunity to build that social graph and detect a known user anywhere on the internet?
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Of course. Privacy is a feature that increases their product value. Moreover, they could get into trouble with the GDPR if they secretly included tracking information in their images.
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So the obvious move is that marketing materials sing how it’s super private, while actual steganography encodes everything to uniquely identify you. If someone discovers something wave it away (and crack down on pesky whistleblowers), eat the fines if the worst happens.
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That's not an obvious move, that's an non-obvious, cynical, "let's assume they are evil and don't care about heavy fines" interpretation.
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And there lies the rub. You can't verify if they do or don't embed such content. These companies are just like "trust me bro".
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Indeed and Google has built its empire through tracking users across the internet so it is really hard to trust that they won't..
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