My favourite explanation of the Monty hall problem is that you probably picked the wrong door as your first choice (because there’s 2/3 chance of it being wrong). Therefore once the third door is removed and you’re given the option to switch you should, because assuming you did pick the wrong door first then the other door has to be the right one

I couldn’t really tell from the article, are they somehow infecting existing routers or is this being installed during manufacturing?

Could it be money laundering?