So, 26 days left before the end of the airdrop. It will end with the end of October then/

You can't be sure about that, they can stop an airdrop in any moment they want.

Why would they do it? They are interested in more visitors and more promotion. There are more chances they would extend the airdrop)

You are right. They promised airdrop should've ended on September:) So, I won't be surprised if they extend it till the end of the year.