how do you think they will do it?
doesn't seem like a very easy thing to do. some of the solutions mentioned in previous comments make it sound too easy to get around the block (other apps, VPN etc).
if I had to guess they will use the front facing cameras of devices and with facial recognition they can accurately predict age (among many others thing I learned including gender, race, sexual orientation and political bias). it's not that unbelievable because they have already been using it in airports and shops for awhile now right (bunnings, Woolworths, coles etc). I am thinking this will have to be a inside OS thing so it can be updated and maintained automatically. it will drain your battery slightly quicker? too bad.
so it will be like this: you (grownup) are watching youtube on your ipad. you are recognised as grown up so no issues so far.
then your niece or nephew comes infront of the tablet screen and is instantly recognized as not a grown up. the video auto stops the entire iPad screen goes blurry with a youtube logo in the middle and a message says "please remove unauthorised viewers from your viscinity".
then you tell your niece to go away and as soon as they look away the video auto resumes. works the same way on insta and tiktok and maybe a list of websites you visit in a browser.
curious as to what you think and if you disagree comment how you think it will work.
Maybe like the alcohol and porn sites where you click to agree you’re over the age requirement