Skype audio graded by workers in China with 'no security measures' (theguardian.com)

"We’ve always disclosed this to customers" Microsoft disclosed that Skype conversations can be recorded and listened to by a random person, really do I understand that correctly?? Seriously why wouldn't this be at least opt-in? Big tech really can get away with anything nowadays, imagine a small company trying to pull that off. Deleting skype account.

How can we be sure they are not doing the same with data flowing in and out of Azure ?