I live in the only city in the Netherlands that has them; Arnhem. It is actually pretty hilly here in comparison with the rest of the Netherlands, so that's why there couldn't be trams
The problem is that trolleybuses belong to mountaneous cities, which Poland has a few (line in the video) - but there are troleybuses in Poland in places where they absolutely don't belong.
They run just as well on the flat. They are the ideal zero emissions bus, especially this type that can run off wire and connect and disconnect automatically