There is a default footer in divi. If you don’t want to use the footer in your layout, you can hide the footer. For an example if you are using a layout without using the footer widget you will see the default footer is showing at the bottom. You can easily hide the footer with a simple CSS. Go to Divi Theme Options, then add the following code in the Custom CSS and Save it.

/* Start Hide Main Footer */
#main-footer{
display: none;
}

Refresh the page, you will see the footer is disappeared.

If you use layouts from Divi Layout Library, you can hide the footer in that way. If you are using any child theme you can just use the code in the style.css of the child theme.