Why would this be different than bank account bonuses, which don't make it to DDMS?
Here, in 15 days you get 200% of what you're putting in, with minimum cash out of pocket. With most other bonuses, after 90 or 180 days, you get 3% or so, with multiple requirements, including sinking $15k or so into those accounts for that entire period.
Much more of a "free money" vibe here.