Earlier quoted context omitted.
It's for this very reason that I'm still one of those old-school guys who still uses MacPorts. I was horrified to see this, and in my brief time using it, it actually caused me real problems, so I went back.
I switched to MacPorts following the Google Analytics debacle [1] and how it was handled [2]. I had this expectation that MacPorts would be backwards and full of ancient packages but it's not - it's fantastic! The package repository is really good, the project itself is stable and it doesn't have a default-on analytics component aggregating my package data at Google. [1] https://news.ycombinator.com/item?id=11566720…
I didn't even realize Homebrew was sending my info to Google Analytics :(. I am a huge fan of Homebrew, but they really should make this opt-in vs automatic by default.
Edit: To opt out (the second line is just for confirmation):
$ brew analytics off
$ brew analytics