The author of the article decided to test the address listed in the GPLv2 license notice by sending a letter to the Free Software Foundation, curious about what would happen. After a few weeks, they received a reply with the full license text, but it was the GPLv3 instead of the GPLv2 they were expecting. The author notes that the GPLv2 was published in 1991, when most people were not online, and the address was likely included as a way for people to obtain a copy of the license. The experiment highlights the differences in communication methods between the past and present.