It doesn't necessarily have to be the case.

I've contributed a few small patches to some well-known open-source projects. In the months after that I've received a few automated mails from some CI systems informing me about some (un)successful build. Probably because somewhere somebody integrated a new version of said open-source projects in their product and the system is configured to mail every committer the outcome of the CI pipeline, regardless of whether that committer is actually an employee... Still sloppy ops though.