In Brazil, in São Paulo, Ketchup on a pizza is part of the culture of the city and maybe the entire state. In my city, though, this culture is not as strong. My favourite flavour has an object on the map: Champignon 🍄 (not Amanita muscaria).
I would ask if the terrain land itself is Pepperoni or what we call here in Brazil "Calabresa". I tried to find a translation in English for this and there is no translation. So I searched on Wikipedia, and I discovered that is something that was invented here in Brazil, by Italian immigrants or its descendants. Another thing that impressed me is that there's no Wiki page for "Linguiça Calabresa" in English, only in Portuguese and two other languages, one of them is Italian:
https://it.m.wikipedia.org/wiki/Lingui%C3%A7a_calabresa
Pizza of "Calabresa" flavor is one of the most common flavors in Brazil, it's more common than Pepperoni, and as important as Margherita or "Portuguesa" that is common here too. Portuguesa is one of my favorites too, with a lot of onions, eggs, ham, olives and oregano.
I'm a pizza freak, so I'll download and play on this terrain often. Thank you.
So Foxhound, now I answer as an italian and as an expert of pizza ofc.

Ketchup is allowed in Italy (so 'accepted') if you have french fries on it. In that case, we can tolerate that

it's because ketchup is a topping for french fries and not for pizza, but I would like to know more about what is the tradition you are talking about.
Yes: the terrain is 'calabresa' flavour

In Italy is almost always referred as 'diavola' (Devil lit.) and it is with tomato sauce, pepperoni and mozzarella. It's called diavola becuase good quality pepperoni are very spicy, it reminds us of the Hell

it's one of my favourite pizzas. Once I asked to a pizzeria to deliver a Pizza Diavola in the convent where I live... :

you can imagine the jokes XD there was even the mother superior!

Calabresa may come from our region 'Calabria', which produces many spicy ingrendients and food. Maybe it comes from that region!
Champignons! Yeah I love those mushrooms, we put usually porcini on pizza, but only if you have money

Super nice terrain Echiko 
Thank you Kaleu! ^^
There are some other toppings in the terrain that aren't shown in the preview btw
