The XPS13 9370 (summer 2018's model) webcam is horrible anyway (still stuck at the bottom of the display). However, it didn't help that it stopped working when the laptop resumed after suspend (all Kubuntu versions I used from 18.04 upwards).
According to this Dell support discussion, it was a BIOS problem that was fixed in BIOS 1.5.0 - I had 1.3.3. Updating seems to have fixed the problem.
Steps:
Get the current BIOS installer from here.
Put it on a flash drive (unless you've got a USB-C one, the Dell dongle works. MicroSDs don't)
Plug in your power supply.
Press F12 during re-boot, select BIOS Flash Update. There should be a drop-down menu top left on the next screen that lets you select and browse the flash drive. Pick the EXE installer. Install. Reboot.
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