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So I read about Cross-device tracking and one of the methods used involves ultrasonic sound being emitted through TV and received by rogue android apps. I think this could be a reason to put a filter in place to remove everything >20khz?
Frankly, most users could cut everything above 10k. That last octave doesn't contribute much anyway, assuming you can hear it at all. To see for yourself, try cutting everything below 10k. Not much going on, usually.