Via HN commenter:
You can join Zoom meetings on your browser too. It's behind these twelve easy steps:
1. Go to zoom.com 2. Click "Join a meeting" 3. Enter meeting id and click Join 4. Ignore the automatic app download 5. Go back 6. Click "Join a meeting" again ...
Follow
...7. Enter meeting id and click Join again 8. Ignore the app download again 9. Click at "If nothing prompts, click here" 10. Click "Join from your browser" 11. Agree to terms of service 12. Enter password and name, click Join
Yes, it actually requires you go back and try again at step 5. What dark pattern?
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!