Well i think you need to know a bit about our country before you getting into that.
We do have a lucrative market in crushing existing granite deposits into makadam, and we do have alot of sand and other earth materials for sale.
But what we are talking about here is pebbles, washed stones out of water areas, lakes, rivers and such. Almost all the water in sweden is protected from exploitation. Companies are literally not allowed to dig in them. And so arent we as citizens either. So making a product out of that resource is basicly illegal. And well the punishment doesnt really fit the crime. Even if you are a landowner arent you allowed to dig into or change these waters. Or actually really exploiting them. Because of one law.
That here is called "Allemansrätten", its kinda unique, but it make all of nature accssible to anyone, even other peoples owned land. But it also comes with the responsibility to not interfere with that nature for profit or exploitation.. This governs alot of our thinking regarding enviromental issues.