Thank you for being patient with me. I can understand how annoying it would be to be banned from a game because of something my son did.
If possible, in your router configuration, could you block access to UDP TCP port 28760 for his computer? This is the port and protocol that AssaultCube uses to get the server list from assault.cubers.net, and blocking internet addresses and search terms will not affect this.
In these unusual circumstances, and because of your work to ensure your son does not play again, I've lifted the ban.
If possible, in your router configuration, could you block access to UDP TCP port 28760 for his computer? This is the port and protocol that AssaultCube uses to get the server list from assault.cubers.net, and blocking internet addresses and search terms will not affect this.
In these unusual circumstances, and because of your work to ensure your son does not play again, I've lifted the ban.