That would be a highly risky bet on Nvidia becoming AWS faster than AWS can become Nvidia.
What they're doing is instead trying to make sure that their GPUs continue to be seen as the best option in the short/medium term (by having them accessible everywhere), and trying to commoditize their complement by giving small cloud providers disproportionate GPU allocations, which they hope will drive customers from the big providers to the smaller ones that a) aren't trying to build their own ML hardware, b) will have less negotiating leverage with Nvidia in the long term.
What they're doing is instead trying to make sure that their GPUs continue to be seen as the best option in the short/medium term (by having them accessible everywhere), and trying to commoditize their complement by giving small cloud providers disproportionate GPU allocations, which they hope will drive customers from the big providers to the smaller ones that a) aren't trying to build their own ML hardware, b) will have less negotiating leverage with Nvidia in the long term.