It's an invasion of privacy that your activity is visible to the entire world. It can have unforeseen consequences. i.e. Employer firing you because you contribute to open source in your free time, Recruiters passing on you if your profile activity isn't lit green due to having a life outside of coding.

All Github/Microsoft has to do is allow people to hide this section of the page from API and Github profile page.

Some people don't want to use Github as a resume!

https://github.com/isaacs/github/issues/142