I have a lot of pictures of copper but none of al wire connection for a water pipeI didn’t ask for the frequency of use
I can show you pictures of code violations so I don't know how a picture would help you. I can tell you that aluminum wire can and indeed is oftentimes used as a GEC. There's absolutely nothing in the code prohibiting it for above ground uses. It can't be used in below grade uses like UFERs or ground rods due to corrosion problems.