New ways of doing business often challenge tax rules written for a different model. That is a concern expressed for many years by several countries. The concern is that it looks like companies that make money by other than selling tangible goods are profiting by activity in the country, but have no permanent establishment in the country, so owe no income tax. For example, a search engine company makes money when someone uses its search engine because it provides data to the company. And if the user clicks on an ad, the search engine company makes money. But no tax revenues go to the user's country.