Do not scan QR code you find online, only scan when paying to another crypto wallet or you want to sell your BTC on an exchange, QR codes can come with malicious things too.
The advice not to scan QR codes found online is wise. I myself am also very careful in this regard because threats can come at any time from unknown QR codes. The best solution is that I only pay cash although other options are also available using the QR code payment menu.