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I can't understand why they are not:

a: building new systems on an internet scale non-relational datastore b: migrating relevant features onto an internet scale non-relational datastore

Are there a lot of folk who are operating at Github's scale still deploying core services to platforms like MySQL?

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Non-relational stores are not a replacement for relational ones. They have different consistency and CAP behavior.

I understand that but you can still write your services around datastores that can scale out better than MySQL?

Not if you need the data to have a different cap and consistency behavior.

MySQL scales out just fine. Anyone who thinks otherwise is simply not well versed enough in how to properly shard data and manage replication topologies.

I say this as someone that despises MySQL.

Same obviously applies for PostgreSQL but is actually slightly harder for a number of reasons with less out of the box solutions like Vitess available.

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