The default hotkeys vary by keyboard layout. To look them up or customize them, click DemoPro in your menubar.
DemoPro does not collect any personal data at all.
To draw on the screen, you need to hold the hotkey down (this will add the pen color to your cursor), draw on the screen with your mouse or trackpad while holding the hotkey, then release the hotkey to resume your demonstration.
There is a hotkey for that. Look it up by clicking DemoPro in your menubar.
Yes. If you have a drawing tablet like a Wacom Intuos, you can use your stylus to draw on any application (pen pressure is currently not supported).
Zooming capability using hotkeys is already built-in MacOS, but you need to enable it. Look under System Preferences > Accessibility > Zoom to turn it on and select a modifier key.
I developped DemoPro because I couldn't find an affordable, lightweight, unobtrusive, and fast tool for live presentations on the mac similar to ZoomIt on Windows.