Recently Putt-Putt (an actual organization) sent Mojang a letter telling them that they should stop using the Putt-Putt trademark for their gain (and Putt-Putt's somehow loss). With the letter they enclosed a picture of google search results "putt putt craft" showing multiple mods and maps showed up for Minecraft. Apparently, they did not know that these were community efforts made not for gain, but simply for fun.
Sources: Twitter and Imgur