By that merit , nobody would use a smartphone for anything. Who do you honestly know that audits the code before downloading an app?

Here's my two sense:

The reason he said fuck it I'm out is because people have been conditioned to believe that circumventing traditional finance is somehow immoral or unethical, when the opposite is true.

He agreed to recieve a small amount , he was curious.

He downloaded the app thinking , "Is this going to get me in trouble , is this what they do on the darkweb etc"

By the time he got to the QR code he had talked himself out of it in his head.

Also the QR code was from an LNBits Pos device, which doesnt resemble anything anyone in fiat land is familiar with.