[manbash]

It's nice that they explain the "what" (...it is doing) but not the "why". Who is going to use it and for what reasons?

Also, if it's essentially a sort of metadata, can't the output generated image be replicated (e.g. screenshot) and thus stripped of any such data?

[ainch]

I've heard of journalists using it to try and figure out whether images sent by sources were generated. In their Nano Banana 2 release blogpost, Google mentioned that SynthID has been used ~20 million times, so there's clearly some interest in identifying AI-generated images.