Author seems to forgot. People doesn't use Non-SQL DBs because Famous X site uses that. Most people choose those because it is easy to use for most of use cases

Author seems to forgot. People doesn't use Non-SQL DBs because Famous X site uses that. Most people choose those because it is easy to use for most of use cases, and often that is what they needed instead RDBMS. Sometime RDBMS are perfect solution. Most of the time simple key-value(or JSON based) DB.