I'm less concerned about "free support" and more about "commons-oriented R&D".
There are some projects/people that I donate a small monthly amount. I don't do it because I'm expecting a specific feature to be developed, but simply because I think it's important to have support developers and let them work on something without being concerned about how to make a living out of their work.
Indeed, that's a very important thing to foster! In fact, I published a post about this just two days ago: https://home.expurple.me/posts/non-profit-foss-solves-the-co...