Of course you can use self-rising flour to make bread, but originally, most self-rising flour was used to make cupcakes.

For example, a cupcake maker for home use.

But if you want to make good bread, you need to have enough gluten, you can add high gluten flour in a one-to-one manner, and you will make soft bread that is not too soft. If you only use self-rising flour to make bread, you will not have enough gluten, and the bread that you make will be very soft in comparison.