Do they accept donations? I couldn’t find anything on the website.
They don't: https://forums.dolphin-emu.org/Thread-dolphin-donations?pid=...
Wise.
I've seen many a fine volonteer project become enshittified because they started optimizing for financial income rather than for having fun.
It's also a smart legal strategy.
Nintendo's lawsuits they won against emulator projects in the past had donation systems as one of, if not the sole main point they drove to win the case.