I alsways assumed the "Dinosaur" brand accompanied many different products and entertainment. Like Disney.
They owned their own pizza chain for a while that proved unsuccessful. Mona Pizza was the final nail in the coffin for "Pizza Dinosaur" but the Dinosaur Corporation still existed.
Curious as to why the pizza dinosaur employees dress up like tokusatsu villains. Actually that might be a reference or so considering if we take Mona into account and if she is the " heroine " it would make sense for her to fight evil pizza men. Perhaps they have other ways of getting money like working for S.H.C.O.C.K.E.R. Chances are Mona rider kicked them out of existing and out of business.