1. Quit Zoom.
2. Kill the ZoomOpener process.
3. cd ~; mv .zoomus/ .zoomus.off/
4. mkdir .zoomus && sudo chown root .zoomus; sudo chmod 600 .zoomus
Now, the Safari permission prompt will show up every time you click on a Zoom link.
Or if you want something drastic, run
chflags simmutable ~/.zoomus
In order to verify that the opener was running, I ran the following command.
ps aux | grep zoom
To kill the opener I ran the following.
Then I followed the rest of the instructions above to create a locked down version of the directory. You could also create a file called .zoomus instead (similar to the suggestions made farther down this comment thread).