That and it's still by far the language backing the most startups that made it big.
Ruby gets results.
Ruby gets results.
This is not the case today. And most of those startups also had to then migrate to Go/Java/etc. to scale.
You can scale anything if architected right.
You can't make languages fast and fun to write in if they aren't that to begin with. There's a lot to be said for dev morale and productivity.
I.e https://news.ycombinator.com/item?id=20349004
"I worked at Twitch from 2014 to 2018... No more Ruby on Rails because no good way was found to scale it organizationally; almost everything is now Go"