No, Google Play will not ban your device , but the apps you install are not synced to your Google account. Google Play Protect may flag the HappyMod APK as "Harmful App" and block the installation.
If you are determined to use a third-party app store, some alternatives are considered marginally safer or have different features compared to HappyMod. ihappymod
How iHappyMod works (simplified)
: The platform relies on a community of users who upload and test mods. Mod Details No, Google Play will not ban your device