For the overwhelmingly paranoid, there is one further possibility: if Microsoft were to make packages available in its repo with the same names as packages in the standard raspbian.raspberripi.org repository specified in /etc/apt/sources.list, it could override the “real” system packages with others of its own making.

I love the “overly paranoid” label, when you’re talking about a repo than can alter “real system packages”.

In what world is this OK?