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One difference is that Rails and MySQL on a Github scale is rare, even when taking into account Github scale is rare.

you mean that most of the other popular huge Rails companies (GitLab, Shopify) use PostgreSQL? Basecamp uses MySQL tho

Gitlab is, AFAIK, nowhere near the scale of Github. Shopify IDK, but I'm fairly certain their type of usage is very different. Basecamp is also of another scale, and certainly a very different usage/performance type.

Shopify primarily uses MySQL, unless something major has changed recently. They've done a number of conference talks and engineering blog posts about their usage of MySQL, see e.g. https://www.google.com/search?q=mysql+site%3Ashopify.enginee...

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