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Is 5% burned in stone?
Why it can't be anything?

Why not 7% ?

Or 10% ?

Or 15%

It is not burned in stone, but since they said they belived that it will be around 5% of the MAU, its interesting to see if we are now more MAU or if it is the premium % that increase.

For me it's more exciting if the MAU is increasing at a big rate each month :)