The four most popular voice assistants: Siri, Google Assistant, Alexa, and Cortana correspond exactly to the four most valuable global brands: Apple, Google, Amazon, and Microsoft.  That isn’t a coincidence.  Voice is the consumer-facing edge of artificial intelligence at the world’s most valuable brands, and that trend is poised to continue.  Consider that a recent article in TechCrunch reports that voice assistants will triple in use to 8 billion worldwide by 2023.