I view this as good news. First, don’t panic. The promotion was ill-thought out by Iberia. It was more generous than they would have wanted to be. It was also taken advantage by customers at scale, which is a benefit, it’s easy for a company to stick it to or ignore one customer by Iberia is going to have to deal with this.
We’ll just wait it out and see how it resolves, but in the mean time they’re already seeming to understand that if they don’t honor the offer the absolute minimum they’re going to have to do is refund tickets.