Matt Mullenweg deactivates WordPress accounts of contributors planning a fork

I've been following the whole story and from what it looks Matt thinks that WordPress is his own property. When something goes open source even the creator needs to be wise enough to understand that it's not his property anymore. I've seen this in many "hybrid" startups that plan to solve the marketing/distribution/ecosystem problem with "partial open source". But the history shows where these frequently end up.

You can't have full ownership of something that you've released to the world, but it takes balls to admit it to yourself.

It is still his property though because he still effectively owns and controls the trademark, despite making efforts to make it appear that he does not.