In the Netherlands at least you can reasonably assume it is compatible with your device when it says "Deck Verified" and can get either a fix or a refund within

In the Netherlands at least you can reasonably assume it is compatible with your device when it says "Deck Verified" and can get either a fix or a refund within a reasonable amount of time (say, 2 weeks) from the place of purchase, I imagine similar countries have similar laws. So from such countries a letter or two should do the trick, but of course only a small percent of people who bothered reading the law know that and they probably don't teach law in middle school.