Another messaging service warrants some attention. The service is called Element. Element was formerly known as Riot and Vector, according to some individuals. The system is based on Matrix; that is, an open source protocol for real time communication. Element, like other modern messaging systems, encrypts data.
Element has the potential to become an open source alternative to encrypted messaging solutions from vendors like Facebook and Telegram.
HOWEVER: Until users of encrypted messaging services demand government respect for privacy, which is a Fourth Amendment issue in the US, governments will continue to pressure and possibly resort to what some may characterize as blackmail. The pressure may be unconstitutional in some countries and unwarranted in others.