Why So Many Canned Cocktails Are Carbonated - Tasting Table
Briefly

Carbonation is utilized in canned cocktail preparations because of its ability to act as a preservative. It introduces yeast fermentation-inhibiting carbon dioxide that fights mold growth.
While carbonation preserves, it also reduces oxygen, which can lead to oxidation and off-putting flavors in fruit juices frequently used in cocktails.
Finding a good canned cocktail is challenging because, while carbonation can enhance preservation, it may also compromise taste, leading to many subpar products.
The fizzy nature of store-bought carbonated cocktails can either result in excellent or awful drinks, illustrating the difficulty in finding a quality option.
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