Integration between WordPress and ActivityPub has been a long time coming. It’s existed in several different iterations over the years, but the latest attempt is directly sponsored by Automattic, the owners of WordPress. This article covers some basic how-tos and explains some various quirks in the integration.
Please correct me if i’m wrong but Automattic is the owner of WordPress.com, a company offering WordPress hosting and plugins.
Sure, they contribute a lot to the WordPress project, but they do not own it.
WordPress is free and open (unlike privately owned companies)
Sure, as an open source project, everybody owns the code. But, Automattic is the corporate arm directly involved with the project, employs many of the project’s developers, and holds the trademark.