Sometimes airdrop uses only to gather participants to join their social media to add more members in the community. Investors nowadays are very smart that even you have a powerful marketing team but the content of the project is poor they will still not invest on it.
Yes, I think airdrop is just a fraudulent community, to cover the eyes of investors, they see a large community and they trust and invest in them, I rarely participate in airdrop. Maybe they cheated a lot