They act as Mona's rivals in various games in the series, but... I never quite understood why they seemingly ended up involved in just about everything. I mean, since when does a pizza company have an American football team?
Or giant robots/weapons?
And who the heck even buys food from them given their reputation? Or for that matter, the fairly isolated location of Diamond City?
Well, about the buying food part, I don't actually know that much about pizza dinoasuar, I've never played wario ware or anything else than the main wario land series.
But when I hear the lyrics from the mona pizza song, I think that it's probably because they're everywhere. KFC has a bad reputation too, and in my opinion they really aren't good, but when you wander through the streets searching for a place to eat and see a KFC, you'd rather go there then continue searching for a burger king or mac(mc?)donalds.
Could that be it?