Apparently iDOS - the ios port of Dosbox - is back in the iOS app store after Apple amended it's policy to allow PC emulation software.
Apparently iDOS 3 was released in August 2024 and should still be available unless Apple had another rethink!
Edit: it's still in the store but it might be a different dev who has uploaded it. It's just a port of open source software but it's being sold for $3 - such is the way with a closed ecosystem like iOS I guess?