Looks like one of the top iOS emulators GBA4iOS has been issued a DMCA takedown notice. With the notice the site has been taken down as well as the in app downloads have been stopped.
From what we understand Nintendo’s main problem is with the in app downloads. So we feel that we will see a update to remove this feature from the app. So for all the people still wanting to play their ROMs you are still able to play ROMs downloaded before the DMCA notice was issued. You just cant download any new ROMs from the in app browser.