Apparently the universe was too hot for electrons to combine with atomic nuclei at first, so everything was a plasma. As it cooled, He grabbed up electrons fir

Apparently the universe was too hot for electrons to combine with atomic nuclei at first, so everything was a plasma. As it cooled, He grabbed up electrons first, forming the first neutral atoms while H+ was still a plasma. So there was a lot of He and H+ bouncing around at high temperature, allowing the first molecules to form as [He-H]+.