It's too early to start the day with such large facepalming...
For the Nth time, what "legal loophole" do you people imagine? Do people saying it's called a donation "for legal reasons" believe Blizzard is on the edge of their seats, all tensed up and ready to pounce, chanting "say it's buying so we can take you down, say it's buying so we can take you down, say it's buying so we can take you down, say it's buying so we can take you down, say it's buying so we can take you down"? If Blizzard had a way to take us down it's not calling it donations as a "legal loophole" that would stop them.
It's called donation simply to make it clear on the label what it is. Some players thinking of it as buying coins doesn't changes the fact it's a donation, which means there's no purchase as far as we, the ones offering that, care. There's no asking money back if you regret something later, because there was no purchase. There's no demanding refunds, because there was no purchase. All are donations made willingly to Warmane. The big difference from other donations that reward donors with gift cards, t-shirts, mugs or whatever is that our "cause" isn't going to attract consistent funding if we don't give more substantial incentives for people to contribute.