So SE, just what happens to those who don't take the 'opportunity'?
Obviously they'll not be able to play, but the way you phrased this means, in English, that after the end of that period transfers won't be possible .. meaning non-transferred accounts are dead and effectively cancelled.
I know you have some bizarre business ideas from time to time, and upsetting many customers by ham-fistedly introducing things like CC security isn't something you seem to worry about, but happily losing players who for some reason weren't able to complete the transfers during the prime holiday season (for many) wouldn't be one even I would expect.
So, why talk about transfers only being possible till the end of August .. or ARE you saying 'transfer by then or lost your accounts entirely'?