Realistically; a typical hyperscale cloud provider has tens/hundreds of millions of dollars invested into a specific CPU platform. It makes very little sense to just throw it out chasing some idealism like "simplicity"; the world is not simple.

You can be like Digitalocean and just say "You want a CPU core, you get a CPU core, no guarantee what it'll be". Most enterprises won't buy this. But, I think there's some interesting use-cases where even a hyperscale provider targeting enterprises could (and do) utilize this; not on an EC2-like product, but as the infrastructure for something like Lambda, or to run the massive number of internal workloads necessary to power highly-managed cloud workloads.