People are only allowed to take funding from investors whose politics align with yours?

"I think this guy is dumb and wrong. Oh no, this dumb wrong guy is going to have outsized influence on a project I'm interested in. Oh no, this dumb wrong guy may profit from a project I'm interested in. Oh no, this dumb wrong guy is using his wealth to do dumb wrong things."

This is a normal and reasonable thought process.

They stated their preference, not that there should be a rule to enforce their preference.