RIP formula 1.

Em, that was against the spirit of the tech regs, not the letter, which just required it to not bend under a given load. And whilst there's no evidence that this is the case, I'm blowed if I know how Macca could detect it without using illicitly obtained information about the details of the Ferrari design.

AFAIK McLaren already confirmed this is exactly how they knew about it - Stepney tipped them off.