In the battle of Telegram vs Signal, Elon Musk casts doubt on the security of the app he once championed

Elon Musk, co-founder of Tesla and SpaceX and owner of X Holdings Corp., speaks at the Milken Institute's Global Conference at the Beverly Hilton Hotel in Beverly Hills, California.

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• Elon Musk once championed encrypted messaging app Signal, promoting its user privacy protections.
• Signal has been sharply criticized recently by a conservative activist and a rival app, Telegram.
• Musk got on board with the criticisms and is propelling the encryption wars forward.