> they can always lend their own account to their kids, which would disable the mechanism

Current technology means statements like this are not necessarily true (these are all referring to the same story, Chinese language link last):

https://www.theregister.com/2021/07/08/tencent_facial_recogn...

https://www.nytimes.com/2021/07/08/business/video-game-facia...

https://mp.weixin.qq.com/s/Cr17TKWQ3XcuNzDw085OLw

    > the new feature sees the company check accounts registered in adults’ names if
    > they are playing games between 10:00PM and 8:00AM.  The company will then run a
    > facial recognition test and, if it identifies someone who is not the account
    > holder, they’ll be booted offline.  “Anyone who refuses or fails face
    > verification will be treated as a minor,” according to a machine translation of
    > Tencent’s QQ post.