I believe getting enough people to donate on a regular basis requires two things: a certain amount of customers have to be real fans of your product, and they have to be aware that the product ceases to exist if nobody donates.

Both aspects are a challenge for software: most people see software as a mere tool, and most people don't see the need for updates (and in fact see them as annoyance).

That's why a twitch streamers or youtube creator can easily get decent amounts of donations while donation buttons in software go completely ignored in almost all cases.

Open source is the one existing model in software development where donations work with some consitency (though donations are mostly in terms of development time, and some widely-used projects still go completely ignored).

For closed source there's are a few working examples with passionate fanbases (mostly games), but for the most part we haven't figured out how to do this well yet.