This is a wordpress fork that will cost people to run and assuming WPEngine is supporting it it'll cost them money to support.
It’s always interesting when people become personally offended when someone dares to make money off of the project they personally open sourced before. Why would you license your stuff with a license that explicitly allows that if you’re salty about the consequences later?
Maybe chose a license you actually stand behind and can live with.
That's really the crux of this OSS pushback, people want all the benefits of being open source, like free labor and marketing, without wanting the ostensible cons.