[txrx0000]

Age verification implies that some authority, usually the tech company, checks your age. It's mandatory personal data harvesting. A method that doesn't require data to be transmitted anywhere is just local permissions and filtering. The tech company should broadcast the metadata of the content they're serving, then the decision to filter it should be made on the client-side according to the device owner's preferences. But big tech is constantly trying to sabotage this permission model by removing root from phones, mandating cloud accounts to use your computer, etc.