What money? There is only a Lego set in your example. A Lego set does not pretend to be money like a gift card does.
If you were to pick one thing to take with you to a desert island for 6 months I guarantee a Lego set would be higher on your list than money. This is because Lego itself has value, at least to those who enjoy using it. Money does not have any intrinsic value outside trade. It is a means to an end. A way to acquire something of actual value to you.
By that logic a Lego set isn’t a gift because the gift giver stipulated that the money could only be spent on a Lego set
What money? There is only a Lego set in your example. A Lego set does not pretend to be money like a gift card does.
If you were to pick one thing to take with you to a desert island for 6 months I guarantee a Lego set would be higher on your list than money. This is because Lego itself has value, at least to those who enjoy using it. Money does not have any intrinsic value outside trade. It is a means to an end. A way to acquire something of actual value to you.