More and more of AWS is available to run on Graviton. It can often be cheaper to use the Graviton instances when possible. And why not, when all you're caring about is having a PostgreSQL RDS instance or OpenSearch or an Athena query, it doesn't really make much difference if its an Intel or AMD or Graviton CPU under the hood so long as the performance per dollar is right.

Microsoft And Google have had Ampere-based CPUs available for over a year. They're still very x86 heavy though.

And don't forget, if you're really craving PowerPC in the cloud you can get LPARs on IBM's cloud for another flavor of non-x86 cloud compute.