It's still AWS/GCP, but it uses instance types with local NVMes.
so it's a "bare metal" virtual machine? Or are they actually using the bare metal offerings for the cloud provider?
Still in virtual machines, but ones with local NVMe drives rather than network-attached storage (EBS, Persistent Disk). This means incredible I/O performance.
https://planetscale.com/blog/benchmarking-postgres