Sign in with a QR code is dangerous though because at that point theres very little stopping QR phishing and forwarding the bluetooth request to your browser. See the most common Discord scam.

> forwarding the bluetooth request to your browser.

This isn't a thing. Discord's QR Code scanning is entirely a feature they made unrelated to passkeys or bluetooth. Passkey auth using a QR code has a step that verifies the proximity of both devices using BLE.