What you're missing is that the block snapshot has been pre selected so no one can cheat their way into creating a bunch of addresses with crazy number of btc's on it. It's all luck this time.
If it was preselected already, what is the chance that at least someone in this world will claim his SEMs?
Semux has community of 150-200 people, maybe no one had his coins out of exchange at the time of snapshot.
Sounds like a lot of work for nothing in this case. Most likely no one who knows that Semux even exists will receive his SEM

That's the point there. We want to invite more people outside who may have btc during the snapshot. This round is intended to spread more awareness outside of the community.
The goal is to have massive awareness and adoption of semux so that once we go live we have more people getting involved.
Other rounds of airdrops will be decided after this.