I mean that was the recommendation back in the 30 series disaster too, buy a prebuilt and try and sell the parts. Cheaper than the scalpers.Pre-builts had priority before in the 4xxx series and 3xxx series. When they promise to deliver these in a much shorter time than a single GPU they allocate GPU's to these because the profit is greater. By how much is debatable but they get more than a single GPU. Also I have noticed articles popping up on my phone saying the best way to get a 5xxx is buy a pre-built. I've seen some quite reasonably priced 5080 pre-builts so you can see why people might go that way. Stick your old GPU in it and sell the whole lot off 2nd hand. Just checked and the 5080 PC's are in stock and the 5090 PC's are 2 week delivery.
Crazy it comes to that though.