Many legacy devices lose access to the Play Store due to outdated security certificates or hardware limitations. APKPure provides a direct source for .apk files without requiring a Google account.
Because APKPure lacks some official security measures found in the Play Store, an integrated scanner could verify the digital signature of legacy APKs against a known database to ensure the file hasn't been tampered with or bundled with malware.
Android 4.2.2 devices generally run on older 32-bit architectures. Modern apps, especially performance-heavy ones like games, are often compiled for 64-bit (arm64-v8a). If you download a modern app bundle from APKPure, the install will fail with a "Parse Error" because the hardware cannot read the code.