We have 10 petabytes of storage and a ~terabyte scale Postgres instance. It runs on a few racks and we get a respectable amount of traffic. It’s not “WeBScALe” but it’s not peanuts. Better uptime than AWS and our operational expenses are negligible. People forget how insanely powerful and cheap hardware is nowadays. Now, you can buy a 64 core chip for $7k. That alone could handle some serious traffic.