An animal that will feed on it's own and have bowel movement is a viable snake, now that does not mean it will have a good quality of life that will depend on the defect itself.
As far as deformities go I believe that snakes with physical deformities should not be released to the general public. The gain and temptation is too irresistible for some people and they will breed anything (kink snake, eyeless snakes, etc).
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