Isn't it supposed to learn from you? IE, answering technically correctly but what it thinks is incorrect is slightly annoying for you, but better for the system in the long run. (ie better for everyone)
Everyone? Or Google? I don't feel particularly happy about being used as a lab rat, so no, thank you - I don't care about the quality of Google's AI. If anything, I would purposefully mislead it if I knew how.
So we will get even more "targeted ads" in our faces? No, thanks. I think ML/AI has a great potential (especially in medicine), but I just don't trust ad companies to use it for any good cause.
Has Google published this training set somewhere? Until they do, you're absolutely right that this is a great way to build a training set, but I don't see how it's to anyone's benefit but Google's.