@mrd you can't scam an airdrop based on a map of existing users filtered by certain parameters. XLM/Stellar had different airdrops in place, some were scammed and some others not. For example, the one based on user map's were not (the airdrop for XRP users with non whale accounts, was not).
You can't abuse this kind of mapped airdrops:
You would have to do it for accounts older than 6 months to avoid people creating >separate accounts to get more money for free. And exclude powerups that happened >after the announcement and 1 week prior to the announcement.