He deserves a lot of credit for shepherding WordPress to where it's at. But like most open source projects, WordPress has become so successful in large part because of his formal and informal commitments to the open source community about how it will be managed. Guido van Rossum spent much of his tenure as the Python BDFL as an employee of Google, but it would have been disastrous for Python if he had gotten on stage at PyCon and declared that anyone who cares about Python had better stop using Bing.