If you have an unencrypted WiFI network that's the same as standing on a street corner and shouting. You have no expectation of privacy under those circumstances, what you say is public.
Even if it wasn't, how much data could Google acquire by driving down a street?, at most they would have a minute of traffic. That's hardly likely to contain anything that's of interest to Google or anyone else.
As for a list of open WiFI networks, that's useless information because network status changes constantly. It's also information that's available to anyone standing on the street. If a malicious person want's to access open networks all they have to do is drive around with a smart phone or a laptop, they aren't going to use Google to fine out where those networks are.
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