Read the cited sources. They were grandfathered in.
(GitHub is a good example of why the policy exists. They borrowed liberally from Git's brand; conflated Git and github.com in the minds of tens of thousands of people, maybe even millions, registered a trademark for "GitHub"; and began going after people who do the very type of borrowing that GitHub themselves did. They ultimately ended up causing issues for the Git project when it sought a trademark, since the GitHub trademark already existed at that point.)
(GitHub is a good example of why the policy exists. They borrowed liberally from Git's brand; conflated Git and github.com in the minds of tens of thousands of people, maybe even millions, registered a trademark for "GitHub"; and began going after people who do the very type of borrowing that GitHub themselves did. They ultimately ended up causing issues for the Git project when it sought a trademark, since the GitHub trademark already existed at that point.)