have you ever had a slice from Lombardi's?
I have, but it's quite far from my apartment and so I have to make an effort to go there. Never ordered delivery from there either. One place I like, out of the "famous" places - is "Artichoke Pizza" down in NYU-land below Washington Square Park. They're famous for their artichoke slices, but also have normal style pies. It sounds terrible, but an artichoke pizza is actually not bad.
Pizza in Moscow is also quite good. I was only poking fun above. Most of the ketchup pizzas disappeared in Moscow by the 2010s. I'm sure it's the same in Poland.
In general - ketchup is good, ketchup is life. At least to us, in Russia, it was a symbol of something exciting and new when everyone first started trying it. Some compared it to our Georgian salsa-like condiment - Adjika. Others claimed they could make it at home, better than Heinz, by using some homemade recipe involving tomato paste, vinegar and salt (imho these experiments always failed).
As a kid I put ketchup on everything. Didn't matter if it was savory, sweet, bitter. I could probably eat ice cream with ketchup on top, back then. If stocks of provisions were low, I would often happily eat some bread with ketchup on it. If I was feeling very wealthy indeed, I would squirt a quarter bottle of ketchup, and a quarter bottle of mayo into a bowl, and make a very nice bootleg "chipotle" sauce, that's orange in color, and goes very well with fries. Incidentally, nobody here in the states puts mayo on their fries, whereas in Belgium or France - they never seem to bring you the ketchup.