Outstanding concept, and a wonderful way to use very simple technology to provide a service we'd all like to have, even if we don't realize it as yet. Question

Outstanding concept, and a wonderful way to use very simple technology to provide a service we'd all like to have, even if we don't realize it as yet. Questions: With something so important, what assurances can be made that 20, 30, 40 years down the road, that this service will still be up and running to do its work? Or does the service itself have such a provision? How does this establish "signs of life?" Do we count things like tweets, Facebook posts, etc.? ('twould probably be cool if we did).. What about in 15 years when we're using xyzzy and plugh? Seems like not only that this service commits to keeping itself up long past the founders are on to bigger and better things, but keeping itself current with the social media of the day. *Wouldn't spinning this as an e-will or "social will" be a good way to help people understand it? Sure, I might want to tell my boss off after the statute of limitations expires, which doesn't count as a will, but those are limited instances.