I'm from Austria and until recently I didn't even know that FB Marketplace was a thing. Never used it in my life. We have a great local website ( https://willhaben.at ) that everyone uses. I guess it's the Austrian version of Craigslist.
First mover advantage, nimbleness, and filters appropriate to regional differences (e.g. in Switzerland, translating easily between the different langages and filtering by canton) make such website stay ahead of the FB juggernaut.