The world in general is often biased by interests and not so much by what most posters here seem to think that there is abolutely not a hint of bias.
Well aside from deliberately excluding shots based on EXIF data which I believe would not be something the competition would do - it would make more sense to day it's just a Canon/Nikon only competition - how much time do you think five judges would spend looking at 50k shots? Enough time to check the shot and then the exif?
If that is the case, why did the gear at the exhibition take up so much space?? Maybe 25%-30% of the size of the image was reserved for the gear being used.
You may well have seen a different version to the one I've seen. The Photos are generally large - about A2 - size and the details of the shot, of which the camera and lens detail is a small part as it includes how the shot was taken and location details plus biography, fits on a postcard. Hardly seems to be too much attention on the branding and way less than you describe.
And not a hint of a secondary interest in this you think? It's possible but I am possibly also too old to be educated into believing that when a brand name is mentioned 50 times at an exhibition (out of a hundred mind you) then this has got NOTHING to do with the brand this is about artistic value "only" ...
Nope, that makes no sense. Sorry.
[snipped details of cameras used]
In contrast to the actual exhibition there were ONLY Nikon and Canon found here. 4 out of 5 judges are associated - or in the case of Matias Klum - a Nikon Ambassador.
Hmm, the most used cameras for wildlife are big DSLRs with long lenses. Shock, horror wildlife photographer judges tend to use big DSLRs with long lenses. Doesn't prove they're biased though.
Let me turn this question around: if the judges had been SONY shooter of Olympus birders, would there also have been Nikon and Canon "only" here??
How many top wildlife photographers fall into that category? Shoot Olympus that is? I did a quick google this morning and none leapt out at me.
Anything is possible, but - call me a cynic - if I see a pattern this strong, I at least ask myself if this is a mere coincidence. If I then read that the judges are associated with the winning gear being used ...
I'll call you a cynic.
Nevermind ...
Note: it is of course entirely possible that none of the 5 judges had any bias and were judging those images without seeing the EXIF.
Possible this is of course!
Like I said, either the automatically filter based on Exif in which case the conditions of entry would reflect that. Or the judges check exif and discard shots from the wrong cameras or all 50k shots submitted. Either option sounds highly unlikely.