Wow, that's almost as bad as a few months ago when they enabled the analytics feature that sends data to Google Analytics for every brew install, list, search, error, etc[0]. Thanks for pointing this out, I've disabled the auto update (HOMEBREW_NO_AUTO_UPDATE=1). Web developers gone crazy with the package manager in your shell!

[0] https://github.com/Homebrew/brew/blob/master/share/doc/homeb...