<p></p>
<h3 dir="auto">Problem</h3>
<p dir="auto">Recently encountered a strange username, the UID of this user is 20978700.</p>
<p dir="auto"><a href="https://www.openstreetmap.org/user/%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B" rel="nofollow">https://www.openstreetmap.org/user/%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B%E2%80%8B</a></p>
<p dir="auto">This was first reported in <a href="https://t.me/OSMTaiwan/12882" rel="nofollow">OSMTW Telegram group</a> and <a href="https://t.me/OpenStreetMapOrg/115740" rel="nofollow">OpenStreetMap.org Telegram group</a>.</p>
<h3 dir="auto">Description</h3>
<p dir="auto">This is using Unicode's <a href="https://en.wikipedia.org/wiki/Zero-width_space" rel="nofollow">"Zero-width Space"</a> (<a href="https://symbl.cc/en/200B/" rel="nofollow">U+200B</a>) for 15 times.</p>
<p dir="auto">I am concerned that this may be used to impersonate other users, and it will be more difficult to distinguish than the confusion caused by the letter "p (U+0070)" in English with "р (U+0440)" Russian. Therefore, I suggest that OWG or other technical teams responsible consider whether this Unicode character should be prohibited from being used in usernames.</p>
<p dir="auto">For example, I can register an account using 14 or 16 zero-width spaces, and they will appear identical to this user. Alternatively, I could register as "快_乐_的_老_鼠_宝_宝" (with each "_" representing a zero-width space).</p>
<h3 dir="auto">Screenshots</h3>
<p dir="auto"><a href="https://github.com/openstreetmap/openstreetmap-website/assets/42690037/7c0a48d3-8289-4e34-bafc-16e9ce6707cc">default.png (view on web)</a></p>

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