Re: A lot of you are *very* keen on protecting your access to smut
More likely they are worried about credit card details or passport details or whatever being submitted to third parties .. given how data has a big tendency to leak.
PII shoudl not be stored, but you can bet it will be - e.g. PCI DSS has strict rules, but audits often find companies breaking the rules & perm storing stuff they shouldn't or for longer than allowed.
e.g. MindGeek (likely to be a big player on age verification) has form on having its data hacked
Plus adding age Id verification is potentially a way to track people.
So it is more about privacy, PII data leaking, than the content (though there is content hypocrisy - why not demand age verification on graphic violent content - that's something I find far more offensive than vanilla pr0n )