When pineapple is a 'locally grown product' and you inhabit a tropical climate. it makes perfect sense to include freshly grown local produce in most menus.
There would be toppings available where you live that someone from where I live would have never considered as a suitable 'pizza topping'.
I put fresh locally-grown mango on cereal along with other tropical fruit toppings that may or may not be available 'fresh' where you live.
Pizza tends to reflect what is an 'average dietary normal' where ever a person lives. Pineapple is widely used here from 'fried on a BBQ' to including it on a typical 'Queensland burger'. I'd be surprised to find it on a pizza or burger menu was I to be ordering a pizza or a burger in Germany just as you NOT finding it on a menu here would be equally surprising.
Ls x