Though in Germany, products sold to children not meeting the criteria (i.e. being bought without the approval of their parents) can be returned, since law place

Though in Germany, products sold to children not meeting the criteria (i.e. being bought without the approval of their parents) can be returned, since law places the fault with the seller. As well as the fact that any product bought online can be returned within 2 weeks without explanation. So there's an incentive for the seller there to limit accidental purchases, since those will likely cost the seller more than the disgruntled parent, who at most has to pay for shipping the product back and forth.