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file (https://www.darwinsys.com/file/) already detects all these formats.

Indeed but as pointed out in the blog post -- file is significantly less accurate that Magika. There are also some file type that we support and file doesn't as reported in the table.

I can't immediately find the dataset used for benchmarking. Is file actually failing on common files or just particularly nasty examples? If it's the latter then how does it compare to Magika on files that an average person is likely to see?

> Is file actually failing on common files or just particularly nasty examples? If it's the latter then how does it compare to Magika on files that an average person is likely to see?

That's not the point in file type guessing is it? Google employs it as an additional security measure for user submitted content which absolutely makes sense given what malware devs do with file types.

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