Since pg can't always talk directly with each and every YC funded startup founder, I believe he writes his essays so all of them has a chance to get his message

Since pg can't always talk directly with each and every YC funded startup founder, I believe he writes his essays so all of them has a chance to get his message. Those texts are deeply related to his core duties at YC and no, I wouldn't call that "regularly blogging" - not even close.