I assume it has been mentioned before in this thread but how is this any different then how Prolific handled the counterfeit PL2303 chips? They updated the driver so it doesn't start if the chip is detected to not be genuine.
Prolific: driver doesn't work with counterfeit chip
FTDI #1: driver bricks deliberately counterfeit/compatible chips by setting USB IDs to zero.
FTDI #2: driver sends "NON GENUINE DEVICE FOUND!" to the ounterfeit/compatible chip regardless of input
FTDI should have simply done the same like Prolific. But bricking chips or sending modified data is an absolute no-go. Neither ethical nor legal (willful damage to property, computer sabotage, vigilantism).
And a lesson for Karel in law basics: There's the principle of keeping damages as low as possible. If someone smashes your car's windscreen, you can't demand more money than a reasonable new windscreen including mounting would cost. If the garage's invoice is higher than that, the bad boy has just to pay for the reasonable replacement. This means for FTDI, as a victim of counterfeit chips, they must not increase the damage to other by bricking chips or sending modified data which could cause havoc, besides this being already illegal anyway. But I'm sure you'll ignore this fact also, still claiming the lack of arguments and also ignoring what's written many times about the proper way to deal with counterfeit products.