This is the post people should point to when someone says "slippery slope is a fallacy" in order to prove them wrong, both for the age verification requirements

This is the post people should point to when someone says "slippery slope is a fallacy" in order to prove them wrong, both for the age verification requirements and for making banks do KYC. But also, your proposal would deter people from reporting crimes because they're not only hesitant to give randos or mass surveillance corporations their social security numbers, they may fear retaliation from the criminals if it leaks. And the same thing happens for people posting content -- identity verification is a deterrent to posting -- which is even worse than a false positive because it's invisible and you don't have the capacity to discover or address it.