I think if we're being pedantic about this, we can agree that WordPress.org itself is not a 501(c)(3) entity or similar, or run under such an entity.

Automattic's legal team somehow considers it a non-profit though.

They tried to set it up that way and were denied. Apparently the flip side of that is they no longer feel constrained to not "Us[e] the resources of the non-profit you control to kneecap a competitor to the for-profit you control."

So like I said, at this point it's no different than RHEL's very stringent trademark protections, and restrictions on using their update servers (cdn.redhat.com) if you're not paying them. The only difference here is that if WP Engine was itself a non-profit, Matt wouldn't be going after them. RHEL is not as generous.

Apparently these are the new rules. If you're a for-profit entity advertising "Wordpress Hosting" instead of "Hosting with Wordpress installed" and want access to the infrastructure of wordpress.org (which costs millions of dollars a year) you now have to pay, either in cash or equivalent contributions.

Personally that seems fair. It should have come with a minimum 90 day public notice period, and the stuff about being a cancer etc. is pretty crazy. Changing marketing language and setting up your own plugin mirror like Bluehost did (https://github.com/bluehost/pluginmirror) is not the end of the world.