Set up a dead man's switch and cryptonuke your LUKS drives.
if i don't log in once every 48 hours my computer nukes it's harddrives.
I don't have descendants
We have policies in place for this scenario. The trusted friend that's supposed clean up and throw stuff away upon your death.
What if you die together?
I have this agreement with multiple friends and I'm a big fan of double redundancy. These friends have never met each other and run in completely different groups. There's an extremely low possibility of 5 of us all dying simultaneously.