So you don’t use open source
You can compare it to public domain work. They are free, as in beer, because their creator is long dead or chose to put them there. He's not gaining anything in return like companies are.
Open source coders provide software development and support services for free. They’re not providing a physical product.
I feel like you’re stuck on some ephemeral concept around what a service is.
Human beings provide a services for a variety of prices. A business provides a profit generating pipeline.
And we all see how those can vanish over night. Or just decide to kill things coughgooglecough
Seems like a contrived line in the sand, IMO