How the Zoom macOS installer does its job without you clicking ‘install’

Having never installed Zoom, and honestly not having photographic memory of how the installation process on MacOS is, how is it supposed to look in the installer?

Also, what happened to just dragging the program into the applications folder? I really liked that way of installing apps, but most things seems to have an annoying click-through wizard.

They embedded their installation into a pre-install script. Normally, you'd go through a next-next-next process with a pkg installer, but in this case you get a popup asking you if you want to allow it to "run a program to determine if the software can be installed" (the purpose of pre-install scripts) immediately after opening the pkg, you authenticate, and then the installer just disappears.

Before that, when they had the shady web server, the zoom application would pop up immediately connected to the right meaning, as your browser would be “waking it up” via http. It looks like they still haven’t fixed this after they removed the http server.