Technically? No.

It'll largely refuse to run ("App can't be opened because it is from an unidentified developer") if it's not signed via Gatekeeper, though.

There's a procedure to bypass that, but it's hardly user-friendly. https://support.apple.com/kb/ph25088?locale=en_US

Yes control click is really complicated.

First, the dialog doesn't give any indication it can be bypassed in that fashion. Second, users should rightfully be suspicious of "just bypass the security!" install instructions - especially non-technical ones.

Because users got a lot of security installing Zoom and BlueJeans since it was signed....

This isn’t unique to these two. Dropbox does some ungodly things when installed on the Mac....