> You're suggesting they purposely put a backdoor into all their custom methods? Why?

I'm not sure what you mean by "custom methods", but I'm not saying they have bypassed the e2e encryption - I'm just saying that they technically could.

And as for why they would do that, they might get compelled by a government to do it secretly. As far as I know that hasn't happened yet but I see no reason it couldn't and it would take a whistleblower to find out.

> Security wise it's amazing. If a company's admin cannot take your data it's excedingly hard for a hacker to do so.

I agree, it is the best option available. But Apple/Meta are technically lying when they say it's impossible for them to read your messages.

They are not lying when they say that they cannot read your messages at rest or in transit without actively changing the code so that you start trusting a new key. The keys sync between devices in ways that Apple cannot read.

This is not bulletproof, because they can potentially change the code to do this - this is what the FBI vs Apple thing was a few years ago was all about.