Add Zoom to avoid list for Video & Voice category
Currently Zoom is far more popular than some other options listed. Besides being proprietary, they have advertised being "end to end encrypted" when there was no encryption at all. Now connections are usually at least TLS secured between users and Zoom's servers, but nothing is E2E yet. When they do roll out their E2E offering they are proposing only activating it for paid accounts, free tier users don't get it. Allowing law enforcement to wiretap is one of their stated reasons for not enabling E2E for the free tier.
Given the massive worldwide popularity, bad track record of security, and false advertising about security I think they merit a mention in our "avoid" list.