The airdrop isn't strictly proportional to the SP, it will be based on your STEEM activity since DTube's inception and your usage of DTube on STEEM. If you never posted a video or voted on one, you won't be eligible for the airdrop. But still, the stronger your votes (i.e. the more stake you have on steem and used on dtube videos), the higher the airdrop you will receive. Do you think we should edit it to be more clear in the application?