SQRL lacks the interest alliance like FIDO to drive its adoption among hardware and software vendors, and it also lacks the resources to promote it to consumers. Currently, all software or hardware vendors actively promoting Passkey are part of the FIDO alliance, such as Microsoft Windows, Google Android, and Apple iOS/macOS. So, GNU/Linux is not included.
Discussion
The main conflict lies in FIDO's requirement that the passkey key cannot be extracted a second time, which essentially promotes vendor lock-in. In the open-source ecosystem, achieving non-vendor-locked passkey key synchronization without secondary key extraction is virtually impossible.