Matt Mullenweg, co-founder of WordPress and CEO of Automattic announced on Reddit that WP Engine initiated legal action against WordPress, Automattic, and Mullenweg himself. Mullenweg wrote that WordPress is countersuing.
WP Engine is a leading managed WordPress host provider that Mullenweg alleges is violating the WordPress trademark.
Similarly to Nextcloud. If you host an instance and remove preinstalled apps, you are obliged to also remove the Nextcloud branding.