Here is a website https://archiveofourown.org built with Ruby on Rails
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.
They use at the date of writing this article:
Ruby version 3.0.5
Rails version 6
Source: their open-source Github repo
Ruby on Rails does scale!
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