Just curious... what do you see as the use cases for this service?
More seriously, I think the core technology would be useful for elderly, people going on hikes into remote areas, etc.
A lawyer can make such a judgment call without falling back to the binary decision of "has the time elapsed with no check-in?".
You could say, I have a bunch of documents that implicate you and they'll be sent out to authorities should I not answer my email or phone at N time.
There's a web-hook switch which is intriguing, though I haven't come up with a good use case yet.