The proper way to handle this security in a home environment is not to give your WiFi password out to your friends, only to your family (or set it up yourself for them, although they may still be able to retrieve the password). It also does not matter what device is reading the QR code: whether it's Redmi, Samsung, Apple, Google, Huawei, or whatever, it can read the QR code and display the network name and password in plain text, although some apps might "mask" the password for basic privacy (but they do have the information). This is just how QR codes for WiFi are done and it doesn't matter if it is a TP-Link, Asus, Linksys, or any other device creating them: the password is in plain text. The QR code isn't something special here: although you can't "read" it per se, any device that knows the standard code used for the QR symbol can read it just like words on a piece of paper. The reason this is showing your password is that the QR code for WiFi information stores and transmits the WiFi password in plain text, so that anyone who scans the QR code will have your WiFi password. The answer to this question is more general than the specific hardware you referenced in your question, and not Android specific in any way, but since this question seems to arise from time to time I will answer it as best I can so that people can see this isn't "magic" in any way.
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