I don't really understand why people (including bloggers) are grouping together the 'people making accounts for their dog and imaginary friend' with those who simply opened new accounts and booked the cheapest flights available. One group is definitely abusing the terms of the terms of the promo, the other is following the rules as advised by Iberia. And even if you feel that booking one way domestic flights was abuse, then you should at least I hope agree that Iberia have not dealt with this well.