New comment by twunde in "Postgres 11 – a First Look"

Historically postgres was slower than MySQL, harder to manage than MySQL, wasn't available on shared hosting and generally speaking wasn't beginner friendly. Because of this a generation of programmers learned MySQL, especially as everything PHP used MySQL. As such the install base for MySQL, was quite large so there were more potential customers for MySQL projects (WordPress, drupal and Joomla all run on mysql, so we're talking about 50% of websites before talking about custom applications)

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