Elon Musk just expressed some choice words over Anthropic, a key partner to Amazon.Rivalries have existed for as long as history can remember. In today's world, we often associate them with sports -- where players, and by extension, the fans -- trade barbs during tense competition. What's more surprising, though, is how similar rhetoric emerges in the corporate arena from time to time.In recent weeks, Palantir Technologies CEO Alex Karp all but declared a decisive victory over his company's competition. Sal ...