Comment by SSLy
Requiring a separate kit made of HDMI cap box, and two usb cables (assuming the box power is feedable via usb) also makes canon create further e-waste. That's only because they're greedy and that stuff is already inside. And nothing on the site of the camera https://www.canon-europe.com/cameras/powershot-g5-x-mark-ii/... gives any indication that such external app and subscription would be required.
> That's only because they're greedy
No, it's because Canon didn't sell OP a webcam. There's no expectation for them to provide webcam software.
If someone wants an external camera that doubles as a webcam with no adapters, that's totally fine for them! They should shop with that in mind.