Probably because there have been more high-profile stories of companies migrating off of Ruby on Rails to something else (e.g. Java, Go, etc) rather than vice-versa of migrating into it.
E.g. the high-profile story of Twitter's previous "whale fail" scaling problems supposedly being partially solved by switching from Ruby to Java/Scala/JVM : https://www.google.com/search?q=twitter+whale+fail+ruby+rail...
Ruby may be unfairly blamed but nevertheless, the narrative is already out there even though other big sites like Shopify, etc still use it.
Probably because there have been more high-profile stories of companies migrating off of Ruby on Rails to something else (e.g. Java, Go, etc) rather than vice-versa of migrating into it.
E.g. the high-profile story of Twitter's previous "whale fail" scaling problems supposedly being partially solved by switching from Ruby to Java/Scala/JVM : https://www.google.com/search?q=twitter+whale+fail+ruby+rail...
Ruby may be unfairly blamed but nevertheless, the narrative is already out there even though other big sites like Shopify, etc still use it.