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The issue is that mobile devices (phones, tablets) are not really designed to run continuously like that. At a minimum, you'd want to remove the battery and connect a separate power source. And even then, the electronics inside might still overheat and degrade.

Can confirm, setup an old galaxy smartphone as a webcam during the pandemic, after a few months the battery turned into a pillow.

Password protected or not, something about that tutorial suggesting to forward ports to an old Android device running a camera software scares me.

That is not a webcam, is an IP cam.

The app says "IP Webcam"