In the same way that links contained in your CTAs on web pages and other forms of marketing content should be clickable and interactive, so should the links contained within email marketing content. Whether they connect to a phone call for a free consultation or a landing page designed to be high-converting, mobile-friendly email marketing should be a priority in any mobile marketing strategy.
Google’s Enhanced Campaigns allow for advertisers to manage bids across devices, locations, and time with ease. Some advertisers may choose to bid higher for users on mobile devices who are within a certain range of their store, or may only want to bid on mobile devices during their store’s open hours, and Enhanced Campaigns make that an easy possibility for advertisers.
Another reason is that if you're using an image as a link, the alt text for that image will be treated similarly to the anchor text of a text link. However, we don't recommend using too many images for links in your site's navigation when text links could serve the same purpose. Lastly, optimizing your image filenames and alt text makes it easier for image search projects like Google Image Search to better understand your images.