You do have the option to dismiss an ad, but that just means that particular advertisement won't show up again. From Samsung's explanation, it doesn't seem that there's an option to turn off the ads ...

Samsung confirms ads are coming to some Family Hub refrigerators in the US through a new software update. Check out the company's statement!

Some users of smart Samsung refrigerators in the US are seeing advertisements. According to Samsung, this is still a pilot project.