I think only logging in won't be enough. The main point is that the account has to be used for up and download. Maybe the 1 gb rule is meant this way:
You don't have to have an transfer of 1 gb every week but in the end if you count your total transfer of a month and divide it by the number of weeks you should have a least transfer of 1 gb per week.
I hope it's clear what I mean. My english is not exactly the best one
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