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"PPSSPP" Sony PSP emulator: "About the Apple announcement"
just added a few lines to their iOS App Store review guidelines, including this: “Additionally, retro game console emulator apps can offer to download games," This seems to imply that retro game console emulators (the PSP is almost 20 years old, that's has to count as "retro") will be allowed in the iOS App Store - however, it's also mentioned later that "links must be provided to all downloadable software", which makes it unclear if it emulators will be allowed to let the user pick from their own files, and not just app-internal downloads. Since we don't own the rights to PSP games, we can't offer them as in-app downloads, users must still obtain the games on their own (by dumping UMDs).
This seems to imply that retro game console emulators (the PSP is almost 20 years old, that's has to count as "retro") will be allowed in the iOS App Store - however, it's also mentioned later that "links must be provided to all downloadable software", which makes it unclear if it emulators will be allowed to let the user pick from their own files, and not just app-internal downloads. So, for PPSSPP to be useful beyond running a small set of free homebrew games, it all depends on how Apple interprets their own rules. If it turns out that the rules now allow emulators with ISO/ROM pickers, PPSSPP will come to the App Store later this year.
Or read this on r/apple