If it proves popular, how do you protect yourself from Google or Apple eating your breakfast by simply implementing this in the OS itself?
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For example, if you're old enough, do you remember those devices that were all about getting your phone/ipod with a 3.5mm jack to interface with your car audio system? There were 3.5mm -> cassette adapters, and bluetooth -> 3.5mm dongles abound before bluetooth became commonplace in cars and phones.