You can never be certain, while my method is wrong and you shouldn't do it, I end up just not trusting any of them and either not participate in any of them and just avoid all of it whenever I can, just not deal with airdrop, that way none of them could hurt me and all of them are scams to me. Of course that's not true and we are not going to get this type of result and I think it has to be something that will take a while.
If your method is wrong then why do it? This is funny because we are only good at giving advice to others but we can't even apply that advice to ourselves. I could also be wrong with that and maybe there are still a few who can? You are only being too careful there but I think it is still wrong to call all projects or those who conduct an airdrop a scam because there are still those that are not. Anyways, I see that you admit that you are wrong. Good. That should lessen your sentence 
. It is still possible though for someone to get scammed if they will not be very careful on dealing with these airdrops. We should look at what we are dealing with right now and we can make a lot of money when we can make some profit as well. So, focus on something that could make us some profit whenever we can. This is why I think airdrops are not easy to find which ones are legit, hence it's easier to just avoid all of them but I know that's not a good way to live in crypto world.
TBH I don't really get what you are trying to say there but I think you are saying that we can earn more with the help of side jobs like airdrops? That's true though but our focus must still be our main jobs first before the rest. Airdrops can be less profitable and very profitable but they are mostly free, and I think that is the reason why we can get scammed easily.