In a compute starved world, big ass data centers are an advantage.
You can kick off more model training runs and experiments than your competitors.
You can kick off a $1-2t IPO claiming you are going to capture a large portion of the largest TAM the world has ever seen.
A rental deal, even at a premium price, actually makes great sense for Anthropic. Rather than building themselves, they are de-risked by renting instead, and they don't own the depreciating asset. They've also compute-starved X.ai as a potential competitor as a marginal added bonus.