There was a thread on this forum with a long ass debate with the site creator over a year ago. You may be able to find it. That site suffers from the same problem as Privnote: you have to trust a third party, which increases your attack surface. It's dumb because you can trivially avoid that attack surface by using PGP. If you were worried about the safety of your info when Privnote went offline for a while, then you should have realize that you don't ultimately trust it and shouldn't use it. If LE takes the SR server offline, you don't have to worry about your PGP encrypted messages being compromised.