Ruby on Rails can scale - here is one example
A case study of an open source web app using Ruby on Rails, managing 300 million monthly visits

Senior Product Engineer, working in Ruby and Rails. Passionate about idea generation, creativity, and programming.
I curate the Short Ruby Newsletter.
Here is a website https://archiveofourown.org built with Ruby on Rails
Data
311 million visits last month (September 2023) - according to similarweb.com
6.3 million users (as publicly shared by archiveofourown.org on their main website)

You can find data that is a bit bigger if you look at for example semrush.com:

Whatever data you pick, this is a big web app with 6 million users and between 300 million and 1 billion visits.
Tech Stack
They use at the date of writing this article:
Ruby version 3.0.5
Rails version 6

Source: their open-source Github repo
Conclusion
Ruby on Rails does scale!
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