Wonder why they're not just giving us access, if it's indeed so good? Seems it's just to generate some noise and hype around Gemini. Hardly believable after the previous faked demo, as someone already said.
For Microsoft it doesn't make a difference. They are taking their own cash, investing it in OpenAI, and then turning right around and booking it as revenue. As a bonus it makes Google look wrong-footed. But fundamentally Microsoft doesn't care how much money they torch doing this.