You also need to afford a Mac machine for testing as a dev. That's another few hundred bucks on top. I don't think macOS users have a bigger responsibility for

You also need to afford a Mac machine for testing as a dev. That's another few hundred bucks on top. I don't think macOS users have a bigger responsibility for paying, but as a publisher I would always make a paid macOS version just to try to regain those expenses again. Time is not equal to money for many people