Not sure why that would be a problem though. We don't intend to lock-in peoples content and we'll provide a REST based read/write API – so you can get the content in and out whenever you want.
How do you go and use this in a website though? That's another facet of the semantic web that I think needs to be addressed too - content is great but if I have to export it from your servers then stick it into my website, that could get to be a pain.
Is Silk maybe going after a Semantic Cloud sort of model? I think that would not only be tenable but a really smart move. I would use a Semantic Cloud service.
I love the idea of a "semantic cloud", it's exactly what we're going for actually. I'm going to use that if you don't mind :-)