i feel like that's a bit silly, the other projects are listed on the donation page (https://donate.wikimedia.org/wiki/FAQ) and tbh you are unlikely to be donating to the wikimedia foundation without being aware of (at least some of?) the rest
Honestly, most of the other projects get almost none of the resources (other then maybe wikidata and commons, but both of those are directly used by wikipedia)
I promise you that 99% of normal people have no idea what the Wikimedia foundation is and think that they're just donating to "fund Wikipedia".