Oxidation will cause a beer to darken and get more 'dull grey in color'... Not sure what's going on with the purple.
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The thought has crossed my mind, but since I mostly keg, I have plenty of bottles for when I do bottle. Also while not against BJCP rules, I believe, I can imagine it raising eyebrows if a beer in an aluminum botle was entered in a BJCP competition.Most competitions have rules against using distinctive packaging. Blind judging doesn't work when you're bottles can be identified across the room.
If these bottles can hold 3-4 v/v carbonation, these bottles could become very popular.