So far only Airdrop or Bounty has given free coins to cryptocurrency enthusiasts, it's just that now there are a lot of scam projects, so you have to be careful,
especially airdrops, avoid airdrops that require you to send a certain amount of BTC to withdraw your prize, most likely airdrops like this are scams.
Yes, there are many fraudulent projects, but it depends only on you whether you will fall into their trap. If you follow simple security rules and don't share your private key, everything will be fine.
You should also create a separate email for such cases, because it can be hacked. And it is best to have a separate wallet from which you then move your valuable coins to another, clean and safe.