No, Amazon is not a monopoly, they are a very large and influential player. You can still buy eclipse glasses (and practically all other products) from other vendors, both physical and online. It may not be as smooth, cheap, fast or convenient as Amazon, but that's pretty damn far from the bar for a monopoly.

There was never any guarantee that the invisible hand would fix badness overnight, merely that it will nudge them in the right direction. Which it does.

That's what the civil court system is for. Nothing invisible about that hand. They are in a world of $#!+ if anyone receives permanent eye damage from counterfeit glasses purchased on Amazon, especially if their insane "inventory commingling" policy turns out to be implicated.

The article only talks about the sun appearing too bright through counterfeit glasses, but the real hazard is a pair of glasses that blocks out enough visible light to allow your pupils to dilate, letting in plenty of the UV they don't block.