It’s the same reason that, if you play MMOs or other online games, the download from the website is a few MB which then downloads multiple GB of data. The purpose is twofold: first, it makes the pathway to play a lot simpler. You don’t have to spend 10 mins on the app store page (or website) downloading the game. And second, downloading the files isn’t the same as installing the content. Something like a mobile game might install a downloader up front to then give you the ability to set up permissions and network information before committing to the full install
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