I think it's time for some sort of a safety standard for a sound frequency to be reserved exclusively for alarm/alert use and that ANC systems have to let through.
It goes without saying, use of said frequency should be prohibited for other purposes, especially marketing.
as soon they do that all kind of companies will start abusing it, for example the sound of all smart phone notification will use exactly that frequency
I think this is a really bad idea unless paired with some regime that penalizes inappropiate use of alarms - and most societies don't treat noise pollution as a real problem. For example, people honk all the time even when there are no safety issues. Or have misconfigured home/car alarms. Outlawing using ANC for blocking "fake alarms" only makes the problem worse.
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this sounds like an amazing idea, the govt should introduce laws so that the companies do this