>I would delete all your past data if you reverted from a paid to a free plan.
Then we'd be seeing posts about momentary subscription lapses (or glitches along those lines) resulting in tons of user data being irrevocably lost.
I think the safest option would be to force the user, when they unsubscribe, to select between "keep everything but on the public free plan" vs. "unsubscribe and then delete everything."
>Then we'd be seeing posts about momentary subscription lapses (or glitches along those lines) resulting in tons of user data being irrevocably lost.
Sure, and this is where, for example, the old Flickr policy was great. You could only see the 1000 newest pics, but all the rest of them were actually still there (and inaccessible to anyone), in case you decided to renew later.
But the way I see it, if you didn't stay on top of payments, my service wasn't important enough to you anyway. A grace period with notification seems perfectly reasonable to me before I delete all your data.
Then we'd be seeing posts about momentary subscription lapses (or glitches along those lines) resulting in tons of user data being irrevocably lost.
I think the safest option would be to force the user, when they unsubscribe, to select between "keep everything but on the public free plan" vs. "unsubscribe and then delete everything."