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DeletedUser218 Disagreeing is fine, you shouldn't blindly follow some internet advice no matter how knowledgeable the person may seem. Good for you on that part.
But your reasoning for why you do not want to agree is flawed. First, let's assume meta decides one day to spy and listen on their users via their phones, do you really think they would just allow the mic to turn on for everyone to see this?
If you'd be a target, again the potential threat actor being able to compromise your device and remotely enable mic would not allow the led to go on just like that randomly.
As for the 0day, do you even understand what's a 0day is for such an app as Whatsapp? The price for such exploit for whomever discovered it would allow them to not work for the rest of their live, and it would not be used on some random internet stranger. Least to say again it would not turn your mic notifications on that's the entire gist of such exploit.
As harsh as it may sound, you're not someone worth targeting with such attack. And meta have better ways of tracking you.