How could they ?
No, seriously. How can someone possibly imagine that taking video from professional customers, what with all the confidential details that inevitably are part of the conversation, and feeding that to a pseudo_AI is a good idea ?
Zoom decided it wanted an AI (what on Earth for ?), and its managers looked and said, well we have this data (why do you have it ?), let's feed that to the monster.
Zero thought, beyond here's a solution.
That's not a brain fart, that's negligence, pure and simple.