Seems there was a change regarding the ETH-SEM Airdrop.
It now reads:
1. You need to have non-zero balance in your Etherum wallet at block #5357795 (Apr-01-2018).
2. You need to sign your Semux address with your Etherum wallet.
3. The airdrop rate is 2 ETH = 1 SEM. You will get at least 1 SEM and at most 500 SEM per address.
4. The total airdrop allocation is 2,000,000 SEM.
5. Applications will be processed on Saturday weekly.
My understanding would be that as long as you had ETH at the point of the snapshot, participants will receive a minimum of 1 SEM. To qualify for more than the bare minimum airdrop, participants would need more than 2 ETH in the registered wallet at the point of the snapshot.
But yeah, we will find out soon enough.