In 2007 I bought a Winnebago that came with a 12 month XM radio subscription. We don't listen to the radio when traveling so we never turned it on after testing it to be sure it worked. About 2 or 3 years later, we discovered that we still had service.
I traded in that Winnebago in April of 2017, and I bet the new owners believe that I am still paying the bill. The XM radio was still working after 10 years.
(I bought an F-150 when I sold the Winnebago, and it came with a 6 month subscription. In a year or two, I will see if it is still functioning.)