You said a lot of words and assumed a hell of a lot of things that were not contained in my question.

I simply asked a simple question out of curiosity, JFC. Does curiosity matter?

For the record, all code is ephemeral so since you're going to end up throwing it away anyway one day, it doesn't fucking matter what language you start with. Pretty much any language can back-end an API until a certain (large) number of users. #ProblemsWe'dLikeToHave

Twitter threw away Ruby and went to Scala; Facebook is slowly replacing PHP with... whatever, pretty much anything is superior to PHP; plenty of other companies have had to do partial or full rewrites of core functionality on a new stack. Paul Graham himself had his Lisp code tossed in a rewrite.

Uber's ripping out Python and going to a bunch of other langs: https://eng.uber.com/tech-stack-part-one/

Uber and Reddit have schemaless db backends for scalability reasons; I doubt they started out that way.

And yet, Discord is still on Elixir. Isn't that interesting. But I think they're putting in pieces of Rust.

So... I just asked a question.