It's never been this easy to build a $1 billion AI company

• You don't have to be Sam Altman to build a $1 billion AI company. 
• Kai-Fu Lee's new startup and Mistral AI have shown that AI companies can scale by going open source.
• The rise of open source has made it easier to achieve the kind of success OpenAI's enjoyed.

The opportunity to build a $1 billion AI business has never seemed this straightforward for entrepreneurs aspiring to be the next Sam Altman.