When I say it's easier, that doesn't mean any app can do it in user space, it's only easier because the OS itself is open source, you can modify it to your liking, and there is a decent community around alternate (also open source) images such as LineageOS which can give you very good control over what user space apps can and cannot do.
If you use an open source version of Android you can prevent even Google from tracking you. With iOS no matter how hard you try you can't really stop Apple from getting your info.
