We want to provide an open source alternative (hardware & firmware). As others mentioned, note that there's a difference between the new Yubikey Security Key (

We want to provide an open source alternative (hardware & firmware). As others mentioned, note that there's a difference between the new Yubikey Security Key (FIDO2 only) and previous Yubikeys, that do multiple things, including pgp/ssh support. By being open, eventually we think that Solo can also support these features, and maybe more. But to start, we want to focus on FIDO2 (and U2F, because FIDO2 is backward compatible).