The Dev should consider using some sort of proof of individuality ( like confirming a telephone number ...etc) to distribute some of the coins it will be more efficient method and it will reach out to a lot more people than the cash back program.
Why?
It would be way more beneficial to everyone if airdrops finished for good. That money would be better spent on dev, mkt and other productive stuff, plus people waiting for future airdrops means LESS people actually BUYING.
It is way better if price does x10 due to that actions than if we all double our stash via airdrop but the price stalls (or even dumps right afterwards).
Not knowing how the remaining coins are going to be distributed cause a lot of uncertainty. Investors hate uncertainty.