They put salt in the soda so that they can add more sugar without it getting too sweet to drink. The sugar level isn't there for taste, otherwise they wouldn't add salt to neutralize the sweetness. It is there in combination with caffeine to be addictive.
What soda are you drinking that adds salt? Maybe you are referring to the sodium, which comes from other sources, like the flavor preservatives, but isn't added so they can add more sugar.
If soda companies could add less sugar they would because sugar costs money.
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