So the problem here is when I scan the private key? It would mean that the people who provide these QR Code scanners have malicious intentions and claim my Private Key if they log data? I'm not sure why these scanner services are all malicious, considering that blockchain.com is the platform I use to redeem Paper Wallets. Or is the danger that someone could take a picture of the QR code when I scan it?
The riskiest part in security with most things is tasks that are being handled in memory. If another rogram is sniffing your ram drives for certain packets of information or triggers as a certain process is run.
Some wallets are more secure than others. Blockchain.com could be hacked or something or information anywhere could be breached. To avoid a breach you'd have to be pretty certain your machine hasn't been hacked and the qr code scanner you're using hasn't turned malicious. It's safer just to not risk it and make a new wallet.