As far as I know, neither of them have had a card unintentionally light on fire.
The whole thing started with Derbauer going to bat for a cable from some 3rd party vendor that he'd admitted he'd already plugged in and out of various cards something like 50 times.
The actual instances that youtubers report on are all reddit posters and other random social media users who would clearly be better off getting a professional installation. The huge popularity for enthusiast consumer hardware, due to the social media hype cycle, has brought a huge number of naive enthusiasts into the arena. And they're getting burned by doing hardware projects on their own. It's entirely unsurprising, given what happens in all other realms of amateur hardware projects.
Most of those who are whinging about their issues are false positive user errors. The actual failure rates (and there are device failures) are far lower, and that's what warrantys are for.
I'm sure the failure rates are blown out of proportion, I agree with that.
But the fact of the matter is that Nvidia has shifted from a consumer business to b2b, and they don't even give a shit about pretending they care anymore. People take beef with that, understandably, and when you couple that with the false marketing, the lack of inventory, the occasional hardware failure, missing ROPs, insane prices that nobody can afford and all the other shit that's wrong with these GPUs, then this is the end result.