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>Rails is the only framework that has proven it _can_ scale.

Citation? Seems like a pretty extraordinary claim.

It was mentioned in the OP but: GitHub, Shopify, AirBnb, Stripe

There are enough business of similar scale being powered by J2EE (or whatever you want to call it today), Spring and ASP.NET.

And a well known fruity brand used to have all their online services on Web Objects for several years.