Got your screenshot email, thanks. Now I understand.
At bottom in backend, the radio "None (Lifetime Membership for Free)" means simply no upgrades on saving the user profile in backend, as with radios, you need one to unselect any other you would have selected
That's there everywhere. The wording could be better, now that I look at it from your perspective
So, it's backend-only and normal, due to the different radios/save UI of backend.