Initially workers are hosted by you but down the road we're looking to add some nice hosted / management features for those who want it (think github hooks for auto-deployment / upgrading of workers) If your data is sensitive you can always encrypt it without too much overhead. We're working on supporting SSL for transport and we have IP-based restriction to queues along with a management console. In our experience, most of the data that goes through our systems is pretty meaningless without context (but we understand that some folks will want something a little extra.)
