I wonder if there is something useful to repurpose that device. I’ve tried it to use it for authentication like Yubikey but it didn’t worked. The authorization prompt would blink too fast. Wonder if they’ve fixed it. 

 That would be a great feature, currently I do use Yubikeys but for other people that that don't have 1 but have a coldcard they could dramatically increase their online security  

 Ledger has micro apps for FIDO U2F and GPG. I didn’t managed to get it properly working though.