True, but probably the solution is not yet another third party who does the same thing as every other third party.

Obviously it's still a problem, but the problem isn't just "I need someone to do this stuff if I die". Rather it's "I need someone I can trust absolutely to this stuff if I die.

By trust absolutely I mean:

  * will not abuse it. 
  * Will not even look at the data I submit and can guarantee this. 
  * will not get hacked and/or can guarantee my data's security if they do get hacked
  * won't get bored with this hobby. Which leads to: 
  * will be there in 1, 10, and 50 years - or can 100% guarantee orderly step down if they don't make it.

More basic short term considerations that also are not addressed by this or any other service:

  * what if  their server is down or under DDoS when I try to confirm my living state? 
  * What if I can't get to a system and miss multiple emails? 

These services are a good idea but there is a lot to be done before they can be considered as solving this problem.