You dont ´HAVE to link you rcredit card to your childs account. You can buy a code. The ones defending turbine ar eno more mindless than the ones bringing up any concerns they may have. Especially since i must admit a lot of the concerns are rather mindless (Not that the defenders are always geniuses). Usually though, the ones making the attacks are the ones belittling the ones defending, since the ones that enjoy the game CLEARLY must be stupid. ANd that has brought on a culture of attack and defence that is beyond proportion.
Anyways, if your kid plays the game, and you wish to keep him/her from using daily dice, dont have a creditcard linked to the account. Buy point codes once a month or two. That way he cant spend any more than the points you have bought. You could also make certain that he/she spends them on something other than shards.