It has been not a mistery on this field but many people have earned decent amount of money literally from nothing... thanks to a method called AIRDROP.

I would not give you another explanation of what these are. Please search by yourself if you find this article by mistake and you never heard before.

Actually there are literally no or few projects that can airdrop a decent amount of coin - I would say more than 100 USD.
This not means there are not still viable platforms or in general new protocols offering this interesting way to promote their product.
Pay attention to scammers. You can waste time and not earn anything.

Here some of the "signals" that I am looking for, before subscribe in airdrop:
- Avoid Airdrops that claims "a big value"  likewise "receive 1000$ in our token"
- if you see a big group in telegram (more then 1000 users) and the project has been launched just few time before, ok this is a scam
- never join or share date with group that are un-moderated , or group were admin refuse to answer to questions, or admin that are aggressive against the members
- avoid airdrop that collect private info like "name" or "email address" or "phone numbers" during airdrop
- avoid services that try to "save money" or have not a WP (Whitepaper) or any road map
- don't waste time in airdrops that claim to be "a revolution" for a certain industry field (and are going to provide all liquidity in free tokens!)