system
A chat on subreddit /r/me_irl
human
I think it was pretty expensive to enter the competition.  Probably like 2x the cost of the pizza, cost them much less than 2x the cost of a pizza.  And it gave them publicity, and people buying way more pizza than you could ever eat.
gpt
Shouldn't the competition cost the price of the pizza? Usually with these, if you finish it you get it free (and maybe a tshirt)