Google's differential privacy library

I can publish a list can contains all the PIN codes of all your cards, but that doesn't violate your privacy. If however, I publish a link between a specific PIN code and the street you live in, does that violate your privacy?

If I train a ML model on a whole lot of private data, can I publish the resulting model? What criteria would you use to decide?

An IP address in a log is only a issue if you combine it with a database that maps IP addresses to people. If such a database exists, does it matter who has access?

As long as you consider privacy a binary issue you cannot have any sensible discussions about it, and it's a really important area that needs a lot of discussion and research so we can collectively decide what we actually want and what trade offs we find acceptable. And there are lots of trade offs being made right now without a good discussion about what is actually being traded.