Not sure that that is quite the case.
"Redmond has had an ongoing feud with the developers at ChevronWP7 ever since the group put out a jailbreak for Phone 7 a year ago, allowing users to run applications …"
AFAIK Redmond's relationship to ChevronWP7 has been reasonably constructive for quite some time. They released a hack (8 - 10 months ago perhaps?) that meant WP7-phone owners could download and install a pre-release version of MS' "NoDo" update and Redmond warned (I believe it was language files issues although I am not sure) that it might result in the phone being bricked when the "real" update arrive OTA. Chevron's people had some meetings with MS engineers, went away and built a fix for those who had installed unofficially and provided it OTA with Redmond's blessing. I am not saying that they invite each other to family reunions but the expression "ongoing feud" seems a little too creative.