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It’s hard enough to tell someone which is best, telling them the particular capitalization is impossible without giving them a direct link.

In addition, preventing duplicate names is fairly hard if you support unicode. Characters like the zero width space, Mongolian vowel separator and many others make it algorithmically different but visually they are the same.

That's not really n issue. You can always compared normalized versions of the name.

The fake one is in the "Apps" section and the real one is in the "Extensions" section. Since apps aren't as popular overall as extensions, it's easier to game that section to get to the top.

Google should make the extension name case insensitive like domain names. That should help a little bit.

Then people will use cyrillic letters, etc. That approach simply does not work.

Yeah its a problem for domain names too: https://www.xudongz.com/blog/2017/idn-phishing/