1) WordPress clearly lacks functionality like ACF that belongs in core
2) Many developers clearly like ACF
3) Many do not (it's messy in the DB, if you ask me)
4) Core functionality that was if not API-compatible, at least API-familiar with ACF would be welcomed by many
5) Creating a new plugin that did this, that was transitioned into core (like other functionality has been), would be a good plan
6) Commandeering the slug for a decade-old commercial plugin like this, to replace it with a fork, is so obviously fucking bad form that it's still hard to believe it is happening even given all the other whatthefuckery that has been happening.
ETA: 7) "Secure Custom Fields"? Really? The difference is what?
What the fuck, Matt?
ETA: personally I understand many of the frustrations with WP Engine's positioning. I have experienced exactly the trademark confusion issues that the lawsuit has been about, where clients have assumed WP Engine is WordPress itself. I don't use them after some iffy customer service and technical issues early on. But this is absurd behaviour.