As far as I know the Netherlands only legalized consumption and sale, but not production? Which just lead to higher demand for products what were still largely supplied by criminal groups.
That said, since December 2023 there has been fully legally-produced cannabis on the Dutch market. While media tends to call it "state weed" ("staatswiet"), it's not nationalized, it's just licensed production. Currently it's only available in a number of cities, chiefly in the South of the country, but more cities should be onboarded onto the system this year.