The problem here is that digital items are fundamentally different from physical ones. Real-world items like physical credentials (even cheap wristbands) are at least somewhat difficult to copy. A digital credential, on the other hand, can be duplicated effortlessly. Imagine a hacker breaks into your computer and steals a single credential: they can now make an unlimited number of copies and use them to power a basically infinite army of bot accounts, or sell them to underage minors, all of whom will appear to have valid credentials.
*本文內容依據BBC國際部（BBC World Service）《紀錄片》（The Documentary）欄目的其中一集撰寫。业内人士推荐下载安装 谷歌浏览器 开启极速安全的 上网之旅。作为进阶阅读
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