Like "appearing under the age of 35" for carding for alcohol (note also that there's no legal requirement to verify age prior to sale), that's not an invalid me

Like "appearing under the age of 35" for carding for alcohol (note also that there's no legal requirement to verify age prior to sale), that's not an invalid method of age validation; there is no requirement for precision, only accuracy. Having an account that's at least 5 years old, assuming a legal age of 13 for registration on most services, should be enough. Some services already do it this way. Others offer to scan and analyze your face or ID. Leisure Suit Larry 1 used 1960s trivia for age verification. Given the list of states and awareness of some notable tech companies that operate out of them, it sounds like someone is doing a little competitive market making with the help of their legislators.