Earlier quoted context omitted.
> why the option of “we ask the user when they install what they want” is not explored. Because Go == Google, and when has Google "asked the user" before slurping data? If they are going to do it, it should only ever be on an OPT-IN basis.
This is very uninteresting data to Google. They are interested in personal data that you can use to optimize targeted ads, not compiler cache miss counts from your local development workflow. The reasoning for not making this opt-in are in the blog post and I find them reasonable.
It's not about how interesting the data is to them, it's about the hubris of believing they are entitled to every last bit of our data.