Apps like Vimusic or InnerTune (available on GitHub, ironically) act as YouTube Music wrappers. They are ad-free and functional, but they do not access Spotify's library. They use YouTube's audio, which has a different catalog.
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Downloading a modded APK from a random GitHub repository is a major security gamble. Because the code has been altered, there is no guarantee that the developer hasn't injected malware, spyware, or keyloggers. There have been documented instances of "Spotify Mod" APKs that hijack devices to serve background ads or steal session tokens. spotify premium android github work