Why? They're business rivals, but when the best business strategy becomes to work together, I'm sure they can put name-calling side. They all agree on the core idea: that their AI will run the society, bedroom to battlefield. That everyone will be the consumer of tokens and rely on AI for all consequential decisions and work, and that big tech companies should be the stewards of this technology, helped by the government.
Their vision is that they're the future kings of the world. I'm sure the throne is big enough for more than one person.