Indeed hence my warning. I'm only sharing this alternative because in practice it works and it's secure (AFAIK).
Edit :
black box security fob
IMHO that's a feature, namely I do not want to OS to mess with this specific part of my setup. I do also have NitroKeys and FPGAs to tinker with but that's different. FWIW if there is an OSHW&FLOSS alternative to the YubiKey Bio please do share.
Indeed, IMHO what's important here is precisely WHY the question is asked, namely is it to evaluate agency, passion as a proxy for skills potentially, or the opportunity to exploit.