Because modern jailbreaks are rare and highly version-dependent, developers use GitHub to distribute decrypted or modified IPA files that users can install without a full system jailbreak. Finding Trusted Cydia IPA Repositories on GitHub
Cydia, as originally conceived by saurik, is no longer the dominant package manager in the jailbreak community. Modern jailbreaks (particularly those for iOS 15+) have moved toward "rootless" architectures that do not modify the system partition. Cydia was not designed for this paradigm, leading to compatibility issues. Cydia Ipa Github