For example, I play a mobile game where if you have an iOS account that is set as an “under 13” account anywhere in the settings, the in-game chat is permanently turned off for you. But, there’s nothing that stops an actual 10-year-old from having an account that doesn’t have the age settings, thusly allowing them to access whatever gets said in the game chat.
The proposals for app devs described in the article also don’t make a lot of sense and sound like huge hurdles to overcome.