To be fair to eBay, their banned items policy is quite extensive.

And also for some reason explicitly lists „military aircraft and ships“. Which surely should be allowed just for the comedic value.

Pepsi at one point had one of the worlds largest navy's so it's not actually that surprising. People buy and sell used military equipment all the time.

I kind of remember MiG’s on Ebay was part of the news cycle after the Soviet collapse.

But my memory is hazy from time and limited direct interest.