Hello,
I would discuss the topic. What do you know about Airdrop? Why do u think ICOs provide us with the airdrops? Do they just want to attract more people? Rise the vaue of their currencies pretending that people buy their cryptos or just share some of their currenies to reward the community?
Btw, I know another reasonable factor of providing airdrops.

There is a company KickCity. They issue their own currency based on Ethereum Network, but at the same time they use referral links program to spread their currency for free as well. So they both attract people and reward them for participating. KickCity - it is marketing company that is known for Decentralized Event Management & Marketing Protocol on Blockchain.
U can find more information on their website https://ico.kickcity.io
                                      and telegram chat https://t.me/kickcity_chat

I believe it is really good to provide airdrops because it contributes towards both companies and community. Many companies use good thing and I believe that it is good until they are scammers.

What i your opinion on this topic? I am interested in hearing any ideas so feel free to say whatever.