Quoting:
There are many things users can and maybe should be concerned about: Hackers, providers, promoters, crooks, spooks, shareholders or maybe the person on the next seat in the bus. Do they want to prevent their data from being used for other purposes than communication itself? Maybe they want their messages to be tamper-evident, or perhaps they want plausible deniability or immunity against eavesdropping? What is the use of end-to-end encryption when there could be a key logger or a rootkit on their device, transmitting everything they do to a remote entity? Encouraging users to believe in a general sense that Signal makes their communication safe, will tend to promote a false sense of once-and-for-all security (regardless of the indisputable and substantial increase in end-to-end encryption). It is very important to remember that even though encryption will increase security, some information should not be stored in IT systems at all – and especially not if they are provided by a third party.
However this is no argument against the use of the Signal messenger or protocol itself. We instead want to think about the problems created or supported by OWS‘ promise of security.