@danielinux @Arcaik @mmu_man also, telegram had at least plausible explanation ("we were going to make server-side source code open from the start, but then we were tipped that a certain government is going to use them to set up their own surveilled messenger and block Telegram on its territory, so that people would not complain too loud because there is a government-managed alternative which is just as great but surveilled; and we had to scrap our plans").
I don't think there is any explanation from Signal?