In reply to schn.

You've obviously been fooled by an April Fools Joke post.

Incsub, the parent company of wpmudev.org, has not been acquired by Automattic nor will it likely ever be acquired by Automattic. It was an April Fools prank posted by it's founder who has had a historically combative relationship with Automattic, Matt and the greater WordPress community in general.

The decision to incorporate the WordPress.com single sign in functionality was entirely a decision made by the team at Stream. This has nothing to do with Automattic whatsoever. They could have just as easily went with using Facebook or Twitter's single sign in API but chose to utilize WordPress.com because it's more targeted to the market in which they cater to.

As for JetPack, i'm not sure what that has to do with the conversation at hand other than the fact it also uses a WordPress.com account. But in that case i'm not sure what exactly you would be expecting considering JetPack is primarily geared towards bringing WordPress.com features and services to self hosted WordPress installs.

Matt and Automattic are not trying to control the entire WordPress ecosystem. The WordPress ecosystem is far bigger than either of them.