Coldcard did start as a fork of the trezor codebase before deciding they aren't open source anymore because forks are something evil thieves do.
In contrast, Trezor puts their money where their mouth is! https://github.com/trezor/trezor-hardware
And they even use open source software (KiCAD) to design their open source software! ❤️
So this fear, that if a design is published that they'll be undercut by a cheap knock off... it just doesn't stand up to real world evidence.
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