For a safe and legal experience, it is always recommended to use the official Spotify app and consider their official Premium plans or the free, ad-supported tier.
Have you already installed this APK? Uninstall it immediately, run a malware scan (Malwarebytes or Bitdefender), and change your Spotify password. Then, enable 2-factor authentication on your Spotify account via your email provider. Spotify Premium Apk 8.4.75.670