Apple has a memory problem and we're all paying for it

I've always been interested in if there were a way to bake more RAM onto these boards. Presumably the pads are there and they're just not populated, so could you make a stencil for the solder balls with a cnc and buy another RAM chip and stick it in to one of those directed heat platforms. Would macos accept that, or would it throw a hissy fit because of miss matched licenses.