Do like banks: Know Your Customer. If someone performs a crime using your assets, you are required to supply evidence to the police. You then ban the person from using your assets. If someone makes false claims, ban that person from making reports.
Now your rate of false positives is low enough to handle.
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.
Do like banks: Know Your Customer. If someone performs a crime using your assets, you are required to supply evidence to the police. You then ban the person from using your assets. If someone makes false claims, ban that person from making reports.
Now your rate of false positives is low enough to handle.