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'obviously' is a tough word in the 'beginners' thread. And so many different camera types in use too.
Are you referring to cameras with viewfinders? And do they all leak? Does it stand to reason?
By which I mean "obviously if you don't have a massive hole in the back of your camera".
If you have a bloody big hole in the back of your camera (an OVF) then it will inevitably leak light into the system and can bork the photo to a greater or lesser extent, that is evidenced by the image above and many shots that I have taken and discarded.
Talking of Nikon, their pro cameras have in built OVF shutters to block this out (still need to remember to close it!), the semi pro ones come with a clip on cover and I believe the consumer models come with a cover too now, and yes if you don't use them then you can end up with problems with your image if you are composing with a tripod (i.e. eye not at the viewfinder) and especially with long exposures where any form of low light is magnified.
I don't know about Canon DSLRs but I imagine they are similar as the system design is basically the same.
Cameras with and EVF, as in my edit you quoted, do not suffer this as they don't have a bloody big hole in the back of the camera to let light leak in.
Does it stand to reason? yes if you look at the design of a DSLR but more importantly it stands to the evidence which has already been posted.