Why? Film History. Lying works. Throughout film distribution history, many films got deals by falsely claiming (lying) to have better acquisition. Two examples from the '90's, 28 Days Later and Open Water, shot in mini-DV, producers got theatrical distribution by lying that they shot in film. Hundreds of 16mm films have been sold by claiming to be 35mm. If you tell a major distributor you shot 1080p DSLR, they'll refuse to even look at your film because its "cheap DSLR crap." They also want to future proof their products with 4K, UltraHD. But here's the thing, they lack the eyes to tell if its 1080p, 2k or 4k. Even if they later discover the truth, they have committed too much money to pull out. And hilariously, almost all the time, you do not get theatrical distribution, but 1080p bluray and web, which is where you started.
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So, in the real world, you have a choice. You can be honest and have distributors spit on your film WITHOUT WATCHING IT because its "1080p DSLR crap." Or, get them to look at it because its 4K UltraHD.