Yeah, it’s not ‘rust’ (the doors & hinges are both aluminum) it’s corrosion.
In Jeeps desire to save $0.12 they assemble the hinge to the door BEFORE painting them. So water creeps in between & the aluminum corrodes.
I went down MANY rabbit holes on this & there’s basically no way to fix it. If you can get it warrantied (which is no guarantee) they fix it the exact same way and it comes back in a few years.
If you try to fix it on your own (I was going to split the parts & prime/paint) you’ve blown your shot at a warranty repair later…
It’s sucks.
Not mine, but starts like below & gets bad quick
View attachment 152142