> ...unless there is a mechanism to keep it all local

I'm not sure the Google is a trustworthy party [0] to believe when they give you some hard-to-find option to keep data local and not use it for user profiling and ad targeting. Google is essentially a data mining business. Some opportunities are simply hard for them to resist.

[0]: <https://www.consumerreports.org/electronics/privacy/google-s...>