If you built your business next to mine, and I shared e.g. my water infrastructure with you for free or for a nominal fee, then one day your business got large enough to threaten my business, am I obligated to let you keep using my water, or should you have figured something else out long ago?
Seems totally fair, right? WordPress is 100% reliant on PHP and getting updates, new features, and security fixes for free, none of which the PHP project is obligated to provide?
Surely Automattic, a company valued at over 7 billion with annual revenues of over 700mil is happily paying Rasmus 50 odd million a year?
No? Why not? Are the rules different for WPEngine and Silver Lake compared to Automattic and Blackrock/Alta Park?
And, you know what? You can't run Wordpress without Linux, Windows, macOS, and maybe a few *BSD operating systems to run it on. I guess Matt's owes Linus and Bill and Tim, and a bunch of BSD project leads another $50mil.