Hmm…definitely maybe; it is a rolling 12mths so whilst it won’t necessarily make any difference to your account today, it could still do so in the future.
The account size is in effect derived from the volume of data stored, which is broadly linked to the number of transactions entered in QF. So more transactions = more data to be stored = increased overheads for QF, which is reasonable to expect that they will try to recover some of these costs from regular users etc.
@ian_roberts presented some very useful averages in a previous post, which should give you a better indication on whether you will need the subscription or not going forward.
Hope this helps.
John