[sweeneyrod]

If what Zoom is doing in the first diagram is end-to-end encryption, what would non-e2e encryption for that set up look like?

[geofft]

Data decrypted when it reaches Zoom's servers, e.g., sending video directly over TLS to a webserver that then sends it to someone else over TLS.

This is what Slack, Skype, Google Hangouts, etc. do.