Is the budget allocated to the current bounty on bitcointalk taken from the 1 billion tokens of Airdrops budget?
Yes, of course. 1B tokens allocated to airdrops is a very long-term budget ~ 20 years.
As you can see from this product video
https://www.youtube.com/watch?v=sYjL8gguMjY (watch until the end) YOUgo interface will contain some prized in YOUcash. So the growth of community will be accurately (to avoid dumps) accompanied with smart promo (airdrops) to stimulate engagement.