I'm asking why Nvidia doesn't maximize their profits by retaining the hardware and selling compute. They could capture the market from those other providers if they sold more FLOPS/kilowatt (or whatever metric is used). Compared to manufacturing GPUs/TPUs, running a datacenter (especially one that specializes in Nvidia hw) would seem to be a trivial task.
Google Cloud Platform hasn't managed to make much of a dent in AWS's business, despite being the only place you can get 'TPUs' and 'bigquery'.
Becoming a successful cloud provider is far from trivial, even if you can offer technology no-one else has.