Looks prone to abuse. Does the BTC address need to be funded? I tried an unfunded address and it got accepted. If yes, at which blockheight?
What is preventing someone from creating 1000 addresses, thus claiming 5000 BTR? Or if there is need to have the addresses funded, spam them with a small amount?
There is a control mechanism to control it. We know is a risk, but we want to be open to newbies, too. The second airdrop will have proportionally ratio against BTC and there will be more advantageous. But we will see after the first airdrop...