I’ve seen many threads suggesting products but they often don’t mention FOSS projects, which should always be preferred to corporate software. With FOSS you are already boycotting capitalism, on either side. Free and Open Source ignores borders and shouldn’t be categorized in nationalist terms, no matter where some of the maintainers happen to live.
Pretty sure American laws explicitly prevent them from working on the Kernel. It’s stupid but that’s what happened iirc
US laws prevented them from contributing while employed in a sanctioned company. Sucky situation for those individuals.