Both Sides Then
I was on the other side of this fun once. Cast your minds back to the pre-internet days of monochrome displays. I bought an application which was written in 16-colors, but I ran it on a four shades of green monitor. Up to then, and afterwards, every 16-color pay-for or free or shareware app I had encountered, rendered OK on a 4-shade of monochrome monitor. Except this one. He had managed to burn-in (no user color settings) two display colors that mapped to the same shade, meaning that much of the information was illegible, encrypted if you like. I pointed this out to the author. He didn't fix the app, but he did diss one of his customers on a discussion group. This was pre-internet, so it might have been Leisure Linc. Something like: "You think you have stupid customers. I got one who complained about the colors of my app, but it turned out he was trying to run it in monochrome. What an idiot !" Endearing, to the hilt.