you mean a dead man's switch as a service?
The message to common forums is clever but sites / apis change too much, it'd have to be a select few big names.
To delete the data requires the keys into the data. If your data has to be wiped, why advertise as much by buying a service that specializes in that - which will undoubtedly be targeted by hackers to get said data and blackmail / cryptolocker people. I sense a high risk investors wouldn't like there. One screw up and trust is lost and you're bust.