Some topics to consider, that those interestdd in such topics have to clear with themselves (source: all Wikipedia):
“The Open Technology Fund (OTF) is a U.S. Government funded program created in 2012 at Radio Free Asia.”
“Radio Free X” (for different X” have a very long history of effecively being made and maintained by CIA.
“Clinton's policy was "heavily influenced by the Internet activism that helped organize the green revolution in Iran in 2009 and other revolutions in the Arab world in 2010 and 2011".[3]”
“Notable projects that the OTF has supported include The Tor Project, Open Whisper Systems,..”
Such associations can at least (directly or indirectly) influence some design decisions.
The best proof against the points like mine would simply be to allow those who want and know how to do that to really use the service completely anonymously, that is, especially without providing some phone number.