I don't understand why Epic is dissatisfied with this. Doesn't the injunction mean that Apple now has to allow other payment processors? Is it that Epic wanted third-party app stores on iOS?
No. This injunction is allowing info\link to website where you can use other payment processor. And Epic wanted to integrate a different payment system directly into the app.
Oh hmm, that's too bad. I'd be dissatisfied too, I hope they win the appeal.
I believe they're disatisified that the App Store wasn't deemed a monopoly
The main reason is the court affirmed Apple's right to terminate Epic's developer account and ban them from the App Store. In other words, this verdict benefits all other developers except Epic.