Apparently, you can turn off ads quite simply.

* How to turn off ads on your Family Hub The widget will appear by default on the fridges as part of the software update. However, Samsung is giving users the option to turn off ads. To do this, go to the Settings page on the fridge, scroll to Advertisements, select it, and you’ll be taken to a screen where you can toggle off ads.

This will remove the widget entirely. If you think you might actually like the widget’s other features (calendar, weather, and news), you can “X” out a particular ad, and it won’t pop up again. But then you’ll get another ad.