It's difficult to imagine a company that cares that much about keeping their video chat data private, but would use any third party service.

That doesn't justify zoom making false claims--I just don't think the companies you're describing would be using zoom.

How would you verify e2e encryption on a proprietary protocol? Not every company that cares about privacy has crypto experts on staff. They should have a reasonable expectation that the vendor is telling the truth.

1. Is the software proprietary? Liability, Denied.

You can't. Don't trust, but verify. If a company or individual needs strong privacy, they should verify any encryption claims.

This would mean using only libre/open source software like Jitsu or Linphone, as one could verify the code or higher experts to verify the code.

So it's okay that Zoom lied because users should have reverse engineered it to verify that what Zoom said about their own product was true?

No, if a company was really worried they shouldn't have opted for a cloud product with a (partly) Chinese-owned company. A lot of companies go through the trouble of giving their employees (especially management) "throw away" phones and/or computers when they send them to "problematic" places, in particular China, but then they install Zoom for their C-level and middle management executives to use, huh?

But everybody knows C-level and middle-management don't actually know anything or do anything. Have at it! Its like spamming the spammers.

You know what it's called when you purposefully lie about your products or services to gain an advantage? Fraud.

If this was happenening in any other industry (except fonance?), the perpetrators would be in jail.