Self destructing emails that gmail or the NSA cant read

Sample link: https://secretink.co/read/2atelv15n5hqip59416c7c3c0q

Why does it send the decryption key to the server (presuming the data is even actually encrypted server-side)? Just use the megaupload model, where you link to an address containing a #, and then client-side javascript to decrypt.

Is it perfectly secure? Of course not, but at least then this company itself can't read them. Now there's nothing NSA-resistent about it. Just NSL secretink.

I love how we are seeing the snapchat-ization and tinder-ization of everything. LA startup scene came out of nowhere!