All airdrops and Bounties are not worth investing time and efforts but airdrops of https://coinmarketcap.com/currencies/wall-street-games/airdrop/ are good and I got reward many times but not every participant gets reward as there are huge number of people who are looking for free money but reward is usually given to 1000 to 2000 participants. Keep trying your luck you never know what tomorrow brings for you. Bounties of Bitcointalk are usually good pay reward but mostly rewards are paid too late so you have to be patient but some are scams too so make good reserch wor before joining a Bountyk program.