Will a major social media platform implement privacy-preserving proof of personhood by 2030?
8
Ṁ336
2029
60%
chance

Major social media platform = ≥100M active users according to Wikipedia

Privacy-preserving proof of personhood = any infrastructure that allows carbon-based Homo sapiens (and no other entities like AIs) proof they're unique individuals without revealing their identity, e.g. something like this

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Does it have to work and if so how well, or are basically snake-oil products (or products quickly worked-around by social engineering, straw accounts, or GAN learning), a yes?

I don't know exactly what threat models you're referring to with "quickly worked-around by social engineering, straw accounts, or GAN learning" so it's hard to say.