It's Covid, egged on by a really decent upgraded card (Ampere), and toasted by dropping prices.
Take the 3060ti for instance. It goes head to head with a 2080Super that retailed for $699. Msrp for the 3060ti is $399, $100 cheaper than a 2070Super.
Add to that the sheer boredom suffered by many teens told to stay home by parents, and then add to that the parents frustration at having a teen home 24hrs a day and a $399 investment with a $60 game is a bargain most parents will not pass up.
Kid gets to spend all day gaming, happy as a pig in slop, and the parents get their TV back, safe in the knowledge their kid is behaving, at home, and not hanging out in groups of other possible Covid carriers.
On top of all that is the scalpers. They'll pre-order the 5 item limit, get their gf or wife to pre-order another 5, get gramdma to pre-order 5 more, get their kid to pre-order 5 more, and before you know it, all 100 gpus are pre-ordered and gone until next shipment, and next shipment, and next shipment, and then the only 3060ti you can find is $599 from AcmeScalper.com