BE CAREFULL
Discord has introduced logging into your account via QR code, which can be useful when the desktop version randomly decides to log you out.
However, there seems to be an exploit of this new feature, so here's a bit of friendly advice:
Do NOT scan a QR code for Discord-related gifts or prizes, including Nitro giveaways, through the Discord mobile app, EVER. You are NOT redeeming the "prize," but instead giving someone full access to your account, regardless of 2FA. Until Discord adds a notice to the app, you'll have to be extremely cautious about this.
If you see someone posting a QR code in your server and claiming it gives Nitro, DO NOT SCAN IT.
Lazy to read? Discord messed up again they added QR code new exploit do not scan QR code if someone told you to and if someone say that he will give you nitro through QR code do not scan it either