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Re:Soft U2F: A software-based U2F authenticator for macOS by Buge on Monday July 24, 2017 @11:21PM (#14844868)
My bet on the reason for creating this: new Macs have no USB-A port, and there are no USB-C U2F tokens that fit flush in the port.

Github isn't too cheap to buy the token. The token they want to buy simply doesn't exist.

Re:Soft U2F: A software-based U2F authenticator for macOS by RainaRelanah on Tuesday July 25, 2017 @02:15AM (#14845511)
By flush, do you mean fully hidden inside the port? Yubikey has the 4C which should work on the MacBook and is the same size as their normal keys.
Re:Soft U2F: A software-based U2F authenticator for macOS by Buge on Friday July 28, 2017 @12:49AM (#14872058)
I mean you put it in the port, and leave it there permanently. Moving the laptop around, putting it in/out of backpacks and bags with no risk of damage or serious snags or pressure.

Yubikey 4C definitely does not qualify.