Interesting view, but what would you do when Github grabs a market share, and then start to take 15% off? I am not trying to be cheeky here, legitimately curious. Microsoft isn't in the non-profit business either, and they will try to make money off anything they could.
For example, did you know that when Microsoft bought NPM, they starved NPM employees for oxygen, forcing people to quit over time, as they were unable to work on anything?
That's anecdotal, and I am simply trying to say that MS isn't charity. Maybe it's worth it to support Patreon and help them to avoid (delay, perhaps) their future predatory behavior?
I am just brainstorming here. I don't know what the right answer is.