WPengine is a piece of shit service preying on entry level WP users and mediocre developers without the skills to avoid getting locked on a platform that makes money out of their limitations and ignorance.
It offers nothing of value and now they are acquiring elemental plug-ins like ACF to have a stronger grip on WP installations.
I hated them 10 years ago. It took too long to expose what they really are: freeloaders taking advantage of both the ignorant and the open source community.
I haven't checked it over there but the drama has been fun to watch. The overly optimistic part of me hopes they'll take each other out and Wordpress will be no more.