I can confirm that I have received a very low percentage of airdrops in which I participated voluntarily, but I was stupid of some of them and therefore I advise you not to give up because one is enough to find a small capital for free.
Yes, basically giving up is not a good choice for anyone because while you can still try, why not continue, regarding the scam, it is a challenge for everyone in terms of researching it in order to find the best among the good.
A lot of depends from the project. Now gaming NFT projects attract a lot of attention and their airdrops are very popular. Just see the results of this airdrop
and you can see how popular gaming airdrops and how many users they have.