Its hard in a corporate structure to just 'donate.' The culture and system is not designed for it very well. This is why selling books or support works out better for foss projects.

Its hard to see SDV as some niche 'indie' project and more and more pedantic definitions of 'indie' aren't helpful. This is a game with an estimated half BILLION in sales. He's extremely wealthy and could have given 50x more easily. Its a bit arbitrary on who or who hasnt done enough. Why no metrics like 10% of your income if you use the tool? "Volunteerism" doesn't work and stuff like this seems like mostly PR and a tip, moreso that "let me help you run this project." I mean does this make monogame better? It seems like a tool that's not really used by any commercial devs. This just seems like a "thank you for helping me get super rich," kind of thing. A tip, which is different than funding a project, fundamentally. You can tip a dying business that is destined to fold shortly, for example. That's not the same as funding it.

This sort of "we are and aren't a business" gray-zone these foss projects live in needs reform, imho. Expecting the kindness of strangers doesn't work. Look at how many foss projects get little to no donations. I don't have the fix here but these developers should probably roll up a LLC and market some kind of service these companies can just easily write invoices for instead of just expecting a random middle-manager to fight the execs to write a $100k check to some guy named Phil in Minnesota that maintains something-something-lib, which is one tiny part of a larger ecosystem that maintains their backend.