TBH, I'm a bit surprised by this interpretation, as we don't have this problem with customers. Maybe it's an HN thing. I think we were only asked once or twice about how updates work. I'll take a look at CleanShot though. Thanks!
My product was originally offered as “one time purchase, one year of updates”, and the customer confusion/anger didn’t show up until I offered a discounted early renewal over Black Friday a few years back.