From the email:

Apple is blocking Fortnite updates and new installs on the ‌App Store‌, and has said they will terminate our ability to develop Fortnite for Apple devices. As a result, the Chapter 2 – Season 4 update (v14.00), did not release on iOS and macOS on August 27.

Apple limits competition so they can collect 30% of consumer payments made in apps like Fortnite, raising the prices you pay. Epic lowered prices through a direct payment option, but Apple is blocking Fortnite in order to prevent Epic from passing on the savings from direct payments to players. Epic has taken legal action to end Apple’s anti-competitive restrictions on mobile device marketplaces. Papers are available for our August 13, August 17, and August 23 filings. In retaliation for this action, Apple blocked your access to Fortnite updates and new installs on all iOS devices.

Apple gave Epic the chance to fix the situation, Epic made the choice to take a stand.

Both sides made choices. Epic is painting a picture of Apple is bully and Epic as choice-less victim. To me, this is just ugly. And disingenuous.