Why is it that giving gifts to each other is not a commodity, but sending text messages to each other is a commodity?

Commodities: Commodities are labor products for exchange.

For gifts and text messages, they are all products of labor. So it depends on whether these two kinds of labor products are used for exchange. The exchange here refers to

Realize the exchange for the purpose of its use value. When exchanging gifts, the purpose of giving gifts is not to get each other's gifts, so this exchange does not have the concept of value exchange.

To put it bluntly, it is not for commercial purposes. In the process of sending short messages, note that in this "process", although you are sending short messages to the other party, you are also paying the operator.

In other words, in the process of texting each other, you have business behavior. So when you send SMS, you and the service provided by the operator (SMS sending) form the behavior of buying goods, so

For me, you bought this short message service, which is the service of the operator, so sending messages to each other is a commodity, and when exchanging gifts, your gift buying behavior occurs before exchanging gifts.

So exchanging gifts is not a commodity.