The funny thing is that it seems that the amount of XLM you get (according to https://keybase.io/a/i/r/d/r/o/p/spacedrop2019) is related to the number of people who sign up.

It appears that the amount of airdrop money is being divided equally amongst all the people who sign up. So in a round-about way, after you have signed up, you are actually incentivized to not spread the news.

As it stands right now, if nobody else signs up, I will receive over $19,000 XLM (roughly $1136 USD).

So yeah. Nobody else sign up for this, please!