[brianaker]

How would Meta/Facebook accomplished this without reading Amazon's communication with its customers?

You have at least two parties in any conversation, I don't see where Youtube or Amazon consented, nevertheless, the recording was being done by Meta/Facebook, which was a third-party to the communication.

There are both Federal and State laws against the sort of wire-tapping that Facebook/Meta performed.

[sp332]

Again, the users installed this app on their own devices. You don't need permission from Youtube to install that kind of thing on your phone. Many, many companies install software like this on company-owned computers and phones so they can tap all internet communications on the internal network and watch for malware or data leaks. It's very common.