"Sure, they made a lot of mistakes" - is a strong understatement given how they have been treating the users. Just look at the history of posts about Zoom here.

Upd: These are not mistakes. They did all that intentionally, fogetting about the security for convenience even when it was beyond reasonable imho.

Upd2: Why downvotes? Some recent headlines from Hacker News:

- "Zoom rolled their own encryption scheme, transmit keys through servers in China"

- "Zoom meetings aren’t end-to-end encrypted, despite marketing"

Are you calling these "mistakes"?