It’s just an additional reward.
If they decided to only give that much, I just receive what they give. There’s no right answer to how much rewards are appropriate.
It’s just a shame that they didn’t properly apply the true meaning of ‘double’.
It is precisely a double of the acquisition rate, not a double of the acquisition amount.
People complained about China’s double event, 66day, so they seem to have introduced a similar monthly event.