To be fair to Nvidia, they're only selling the pickaxes in this gold craze. It's smart for them to focus on the market that pays the most. When the AI bubble pops, they'll still be in a great position and they'll be able to return to gaming.
They are training AI models.
They are investing in AI companies (OpenAI).
Are they only selling pickaxes? I thought they were also investing in prospecting firms, who then turn around and buy more pickaxes. Seems kind of dodgy, but also a lot riskier than just selling pickaxes.