It is open source and their encryption protocol (olm) also had an independent audit, but the not servers or clients.

Not just Israeli funded, started inside Amdocs even. Idk if it’s backdoored but it pisses metadata to all servers it federates with including matrix’s which you basically have to federate with as it’s the “default” and even if mossad were spying on that metadata but still couldn’t read message data that’s not great either.

The initial project was created inside Amdocs, while building a chat tool called “Amdocs Unified Communications”, by Matthew Hodgson and Amandine Le Pape.

In early 2000, federal agencies conducted a counterintelligence investigation to determine if Amdocs was being used by Israel to eavesdrop on U.S. government communications. The investigation found no evidence of such activity. In 2009, the South African State Security Agency suspected Amdocs was being used by Mossad to spy on South African citizens.