https://en.wikipedia.org/wiki/Design_rule_for_Camera_File_sy...
TFA, "Apple uses the ‘IMG_XXXX’ naming convention for all images and videos captured on iOS devices, where XXXX is a unique sequence number." isn't very accurate, as the numbers are not unique. They're just sequential. if you take 1001 images, the file system will actually create a new folder and roll the digits back to 0000 to avoid overwriting
You'd be thinking wrong. Canon cameras also use the IMG_ format. It's been a while since I've dealt with GoPros, but I'm pretty sure they are IMG_ as well.
While it's nice to hold onto what you know from experience, extrapolating that to end-all-be-all knowledge is just not a good stance. Especially in the light of information from people with wider breadth of information.
That's a sweeping statement that is definitely not true for all cameras Canon has made.