Roti asks a good question.
The reason the Star alliance ran the promotion, is to build loyalty (obviously) to their carriers. i.e., Fly UA from the U.S to Europe, SK or LH in Europe and then maybe TG on to Asia.
Oneworld will probably do the same thing for the same reason. I suspect you will see a promotion towards the end of the summer when Iberia and Finnair come on line.
The existing promotion between BA and Qantas has more to do with BA's 25% stake in Qantas.
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speedbird001