u're mistaken. int hon have changed to F2P as well.
those who purchased their account before the F2P implementation have Legacy status, which means they have all heroes unlocked except for EA heroes.
and for accounts created after F2P implementation are the same as GRN.

quite a number of accounts in GRN are legacy status because these people have prepurchased their account during int hon's close/open beta or before the region segregation.

haha...kesian you...
you could've contacted S2 directly as i've read before that some ppl did that and they manage to get their account in grn to become legacy status on top of the bonuses grn gives to those who pre-purchased int hon (2k gold, shield and taunt or something)