I understand your frustration, but I have a couple of counter-examples, and I don't offer them in any derogatory way.
1) Notes looks a lot like Standard Notes. If you built Notes using copy-left, OSS it's hard to complain unless you pay "royalties" to all the programmers whose work was incorporated into yours.
2) I am probably atypical. I have used Linux for over 20 years, but I can't write so much as a Bash script or a Perl one-liner. Yet I have spent a whole lot more money on software than I would have (or most individuals do) on other platforms. Because I can't code and appreciate the work of others and the freedom it gives me I support the following (not exclusive):
* Kaisen (my distro) and Debian (the distro Kaisen is built on) both
* tFSF for both core utilities and Emacs
* My DE (KDE), and even if I prefer the UI of other applications I mostly try to use those provided by KDE,tFSF, Debian, or Kaisen (e.g Akregator over RSSGuard) unless I donate, like:
* Mozilla (for Firefox), but
* Betterbird for my email client
* Syncthing
* LaGrange (gopher/gemini)
* Joplin
* ClipTo
* and more, including services (e.g. SoulSeek, envs.net)
Some annually, some monthly, some one-time.
In fact, when Standard Notes first came out I paid for a seven year subscription, and then ended up using it for about 2 months before becoming dissatisfied. There are some, like Alacritty, that I use extensively but which I have found no way to donate to, but I try to keep it to a minimum.