With news today that the Catalan authorities have fined Airbnb €30,000 for proving too popular with holidaymakers, taxi app Uber also faces further legal challenges from states throughout Europe. What both have in common is that they cut out state regulation - of taxis and of hotel and tourist accommodation. Their joint demographic is likely to be young and on a budget; us oldies are less concerned with saving a few quid for a bed with no fire safety or a cab with no MOT.
Anyone who has ever used Barcelona airport will be familiar with the scene below; one in ten of the local population seems to be a cab driver, but with only a dozen fares every hour it can't possibly be a paying occupation. It is, I suspect, the local version of a Keynesian solution to unemployment.
Uber undermines the ability of the State to intervene economically by using control and regulation - and that's why States are so opposed to these apps.
Together with the computer code behind Bitcoin - NOT Bitcoin itself, but the code for secure distributed ledger systems behind it that is set to revolutionise the traditional role of the State in economic management - these evolutions will cause changes beyond the ability of governments to control.
We're just seeing the start of it.