The majority of children in the 6โ12 age group are highly unlikely to download, configure, or subscribe to VPNs without adult help.
The naivety! It's like 5 clicks to download and use Proton VPN. You don't even need to register!
Even if it were more difficult, children have friends. They talk to each other.
Also grouping 6 and 12 year olds together is an interesting choice. Sure, a 6 year old is unlikely to do this, but why would a 6 year old even try?