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Context if you already know Automattic's recent actions: ACF is the most popular WordPress plugin, created and maintained by WP Engine.

It was not created by WP Engine, they bought a mature product from the original developer Elliot Condon.

WP Engine buy it from Condon, he had already sold it to another company. WP Engine purchased that company and their suite of plugins

Also not the most popular WP plugin — that’d be Yoast SEO.