I mainly work on plugins for tools that I use, which is currently Obsidian.md (Metadata Menu, Ical, ...). All of my open source contributions and tools will always be 100% free; donations are just a way to support development, CI costs, or to say thanks.
I accept donations which go towards future development efforts. I generally do not accept payment for bug bounties/feature requests, as financial incentives add stress/expectations which I want to avoid for a hobby project!