Push notifications are messages or alerts delivered by your app to the user. These messages appear on the home screen of a user’s mobile device regardless of whether the user is engaged with the app or even has it open. For a push notification to work, the user needs to have already downloaded your app and agreed to allow push notifications. Luckily, 70% of mobile users allow push notifications.
Search engines may penalize sites they discover using black hat methods, either by reducing their rankings or eliminating their listings from their databases altogether. Such penalties can be applied either automatically by the search engines' algorithms, or by a manual site review. One example was the February 2006 Google removal of both BMW Germany and Ricoh Germany for use of deceptive practices.[52] Both companies, however, quickly apologized, fixed the offending pages, and were restored to Google's list.[53]

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.
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