The most liberal weed country in the world Holland still hasn't fully legalised it. Its allowed to be sold in the coffee shops, but only up to certain amounts and only so much can be stored on the premisis. The Dutch aren't bothered about personal use amounts, which is the case here pretty much.
But even the Dutch seize cannabis in commercial quantities as its still illegal to import cannabis into Holland and these are the supplies for the coffee shops, where else do you think they get their stock from.
There's no legal way of them getting their supply. That's Holland, way ahead of the UK in their control of cannabis
As far as I was aware the number of coffee shops was being reduced and more tightly controlled, as the majority of Dutch folk don't partake, its all for the tourists