So do you think this is a waste of time? Airdrops, bounty programs and all this things
Not all of them. Bounty programs are much different things than airdrops. In bounty you receive reward for some actions - you advertise the project and help to spread it and you receive reward for that when in airdrop you receive reward mostly for your existance
So thats because there is so much scam in airdrops - it is easy