In Czechia (where a pirate party is currently a part of the government) it was IMHO quite the reverse - the Czech Pirate Party mostly gained popularity by accenting ordinary center-liberal political themes.
The Pirate Party of Canada used to be quite active on r/CanadaPolitics. Once they fleshed out their platform they ended up overlapping heavily with the NDP and Greens (particularly the Greens).
I think many Pirate Parties have fallen into similar traps when they fleshed out their platform.
Yes, pretty much. There are Greens in Czechia but they are more left-progressive (compared to center-liberal pirates) and they are unacceptable for many because of their anti-nuclear position.