“As a result of this block, sites using WP Engine’s solutions cannot install plug-ins or update their themes.”
Matt Mullenweg runs Automattic and controls WordPress.org, and he used the second to hit a competitor of the first. Sites on WP Engine lost plugin and theme updates, and reportedly security updates. The trademark policy got a WP Engine example added the day before the ban. That is a shakedown with a terms-of-service page attached.