If you are newbie and you are looking for ways of making some Bitcoin and other altcoin, be very CAREFUL with AIRDROP campaign as many of them out there are out to scam/milk you with the little ones at your disposal. Sometimes, they are out to get your personal information like email address, etc and sell it out for money.
Some of them will tell you to send some amount of BTC or ethereum to their address as fee for you to get the aclaimed airdrop reward of which they will later run away and mute their telegram channel.
Be warn is to be armed.
I belive there is no good Airdrops are available in this 2020. As i exprianced, most of them are cheater. They fruad with people with verious way as you have already mentioned in your topic. Some emails from them, contains harmful link that can be hack email address. Moreover airdrops are Vauleless nowadays. So it's nothing but waste of time
Yes, there is no good airdrops available right now. All of them are just a waste of time, they are just collecting emails and people to become part of their channels or social media and then their participants will receive nothing or sometimes they will only receive a coin with no value.