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.
I have been following some of these movements in the last few weeks and, at least the ones I know of, include FOSS in the alternatives to American products and services. So while I support what you say 100%, in my experience so far, it looks like most people are aware of this.