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Would this apply to all of google, or just specific product areas (ie, would you only nationalize Search, or Search & Ads, or something else)?Mostly search. We'll drop the ads. People will be subsidising search already, so no need for ads.
>If yes, do tensorflow development now fall under the purview of the UN?
No, that Alphabet can keep.
>Is Android now a partially closed-source, world-government administered, operating system, used by a significant fraction of every human being?
Yes.
>If not, how does one manage infrastructure for the now government administered search system, and corporate everything-else? Do they share the datacenters (and thus give government employees access to the datacenters full of user data), or do they split the datacenters up somehow, and give some to the government, and keep others?
Every piece of data will be queryable by a simple RESTful API for everybody, including everybody's else search history. We'll call it "radical transparency". This is include the data of government members.
>What happens to my existing Google Account?
It remains as is, only better.
>Does the government get access to any of my user data, and if so, which subset?
Yes, all, see above.
>Do we do away with search personalization, or start it over from scratch?
We kill that. It never worked well anyway.
I'm partly joking, and partly imagining what a sane humanity, that could build and coordinate stuff on a global scale without letting them to the markets, in other words a "Star Trek" like government, would do.