I've noticed on ebay there are a lot of 3090s for sale that seem to have rusted or corroded heatsinks. I actually can't recall seeing this with used GPUs before

I've noticed on ebay there are a lot of 3090s for sale that seem to have rusted or corroded heatsinks. I actually can't recall seeing this with used GPUs before but maybe I just haven't paying attention. Does this have to do with running them flat out in a basement or something?