Comment by mikemcquaid

I'm the maintainer who added this. I apologise for the poor communication. I would have responded sooner but I've been on a plane for the last 10 hours. I'd hoped the documentation would have made clear our reasons for doing this but I feel the discomfort so since getting off my flight I've opened and merged three PRs (https://github.com/Homebrew/install/pull/42 https://github.com/Homebrew/brew/pull/143 https://github.com/Homebrew/brew/pull/146) to better communicate this to our users on installation and `brew update` before any information is sent and ease the opt-out process.