Sure... but it would have to be proper-as-in-proper. And what are the chances of that? Seems to be hard enough to even enforce the rule that ``-O3 -g'' is a thing, let alone all the rest :(
It would be ok if it is voluntary - you can upload your face and choose what information about you is shown, not if someone scans the entire internet to collect as mush information as possible and make an app of that.
It ostensibly is a tool that follows the model/philosophy of unix: ie, a command line utility that does one thing well, inputs and outputs are text so they can be piped together, etc.
Adding noise to a signal to cause it to be perceived unintuitively. It's possible that, as others pointed out, optical illusions are an example of this. But in actuality, if such a thing existed, I'm not sure we'd be able to tell it's adversarial.
No, it wouldn't. First of all, it is obvious that there will be no consensus. And even if there was consensus it would be very challenging to do because deploying a hardfork takes time while criminal could transfer his money before the hardfork to a different address.
And of course choosing the standard Cyrillic-alphabet language