I was a Prime subscriber, then I let it slide. After that I tried to sign up again. The robot said it was sending me an email, which I never got (@gmail). I tried that a couple of times.
Then I noticed that I seem to have full access to The Hive. I'm pretty sure I haven't been billed for anything new.
If I go to "account settings" and select "subscribe" on the left, I get a screen asking me to sign up. So parts of the system think I'm not signed up. But I do seem to have Prime access to The Hive.