Images from Pizza Hut Japan.
Most of what is given as part of campaigns is of limited utility. In fact, cups and bowls tend to be the biggest "gifts" that come with overpriced food. This time, they're offering a wooden "tray" and a cutter which could conceivably be useful. That being said, if you buy a pizza from Pizza Hut, there's a pretty good chance that they're going to cut the pizza for you and you'll eat it out of the box rather than grease up the adorable little Rilakkuma tray.
Personally, I think that the wooden tray would be put to better use as part of some sort of S & M furry activity... not that I think about that sort of thing or anything.