I haven't used it, but macOS does have screen sharing built into Messages.
I wonder how could Apple take 30% their revenue out of this -- yeah, by forcing them to submit the apps to the AppStore instead!
Yes. But neither are distributed on the App Store, so…
Second, Zoom already runs sandboxed for the other two ways you can run their client on Apple operating systems: the (iOS) App Store and the web. The Mac sandbox is the least strict of the three. So whatever they do, it doesn't seem to be hindered by 'severe limitations'.
I have yet to hear any feature that a legitimate videoconferencing application would need that would be disallowed by the macOS sandbox. Lots of other video chat apps are on the Mac App Store, like Facebook Messenger. Is the issue simply that Zoom is being sketchy and wants to continue to be sketchy, and sandboxing would not allow them to? That's not because the MAS is 'a trap'. That's its main feature.
And these apps deserve to have “breaking opening from Finder” and even more restrictions considering they have shown themselves to be completely untrustworthy, insecure, invasive and hostile.
It even works in Safari on an iPhone (!!!!!!).
By the time we were done -- I use copilot (basically VNC with NAT punching built in) -- and I got control of the laptop to just do it myself, there were 7 downloads and 4 unzip attempts.
My MIL and I have literally had facetime pointed at her laptop while I directed her where to to get copilot running for the quarterly cleansing-of-the-spyware.