Hard to imagine anyone using a cloud GPU for anything else.
If you’re trying to accomplish a goal, how long are you willing to wait for your entire dependency tree to be engineered in-house. It’s happening slowly, but teams have to ship, and can’t wait for other teams to build fresh tools.
Additionally, the compute hardware is rented, and if there’s no alternatives available for rent it doesn’t matter. Data centers aren’t full of NVidia and AMD GPUs and TPUs (because the support isn’t there). It’s a crazy chicken/egg situation where everyone benefits but no one makes the move. It’s slowly happening, but it’s not there yet to totally replace them.
They can be building on nvidia and have a semiconductor team in another corner experimenting for alternate in the future.
When profit margins are insane, there is always competition quietly fomenting.
We just won't know until they release it because it's also a competitive advantage to keep your own plans underwrap until it's ready. Or else it may start an arms race that'll only drive up costs to get done faster.