That's interesting. Except for $GIGANTIC_CO (like, BofA, or the government), i'd expect a SLA that describes service resiliency and not "well, our service will be up because we're on AWS".

Why would you need to disclose your hosting provider? is that really a concern for hosted services (and if it is, why isn't the customer hosting it in their cloud?)

Most customers do not want to host anything if they can prevent it. My employer was selling the servers that host the entire shebang, and most did not want to host them. We'd explain they'd save a lot by hosting and viewing/streaming everything locally, but their IT people were not comfortable, and their execs wanted to see everything on their phones when not at work. We made it all plug and play, and still they wanted to pay 10-20X more for a web service.