Those widget areas in the footer are so helpful in many WordPress Theme layouts. I use the term ‘multi widgets’ for lack of another term. By multi widgets I mean the user adds one, two or three (could be more) widgets in a particular widget area and then the theme displays the added widgets spread evenly across the width of the page. A few images will put this into perspective.
If your WordPress theme originates from Underscores and you have not changed the default code in the footer there is a good chance that the Theme Check plugin will show that there is a possible hard-coded link in the code. This bit of information does not mean that there is anything wrong with your theme but for a user or prospective user of your theme, this bit of information could be problematic.