Be interesting to see how they handle that. The "elephant in the room sized" loophole of subscribing only long enough to get the HW3 upgrade for free, then canceling, should be apparent to anyone, including those at tesla. It would not make sense for subscribers to get HW3 for free, so either they make it a requirement to already have HW3 to do the subscription, or dont offer all features available on FSD to those who DO subscribe and have HW version lower than 3.
Thats the only thing that makes sense, but there will be many who post here who will "discuss / assume / complain" about either one of those paths. If tesla says "must have HW3.0 to subscribe" there will be a whole bunch of people here who complain about that and say stuff like "I have EAP, why cant I do this, tesla PROMISED ME blah blah blah. Tesla should give me the HW3.0 for free / drastically reduced price to try this out!!!!111!!!"
If tesla says "you can subscribe, but with HW2.5 you wont get features much past EAP" those same people complain that its not a fair test, not a fair subscription, why are they being left behind, blah blah".