For me, I love pineapple on pizza.
I think it's cultural + taste.
I am from the Philippines, and if I'm not mistaken, we are one of the world's largest producer and exporter of pineapple (though it's not native). This made pineapples a part of our culture (we also produce other products out of pineapple leaves, for example) and culinary, and our taste developed with it a part of everything.
Our famous Filipino #adobo, one variant is to add pineapples, which will give the food a very rich taste.
So, when pizza came here in the #Philippines, there definitely should be pineapple on it.
^_^