Microsoft put that theory in practice with the release of Windows 2000 which offered support for the Kerberos security protocol. But that protocol was extended. The specifications of those extensions could be freely downloaded but required to accept a license which forbid you to implement those extensions. As soon as you clicked “OK”, you could not work on any open source version of Kerberos. The goal was explicitly to kill any competing networking project such as Samba.

This is a great article describing exactly how Meta can control the fediverse and destroy smaller instances with anti-competitve practices.