That's what I've understood, they'll have to provide bandwidth, and they'll have to use as much upload as download (though that's rarely a problem).. But still, scaling it would be interesting, but as a proof of concept it's still interesting, as they're not providing storage or processing.
I'm more curious as to the legal implications of what people might share when using the service, even if (s)he's not the one hosting, (s)he's providing bandwidth and enabling access.
Just as any other intermediate device, service, or system is doing.
The host ISP, the hostyoself.com ISP, the various routers, firewalls, networks between the two, and all the same for the end-user, any proxy servers on the path, etc. A lot of entities are hosting/enabling access to the content.
That's why it's interesting, in Sweden a person is = IP. Which in this case is considered the owner. There's also been a case recently where a private person has been hold personally responsible for other peoples facebook comments.
