In my experience the best bounties I have participated in have been NEP-5 ICO's. There are several ways to participate and the tokens received are actually worth something unlike many ERC20 bouties/airdrops I have participated in.
I started holding NEO in December and have been accumulating during dips. By holding NEO you not only earn gas but many of the NEP-5 projects airdrop tokens to NEO holders. Between the airdrops and bounties I have earned many free tokens that have added $$ to my portfolio. I would say that I have been rewarded fairly for the task I have completed through NEP5 bounties.
The bounties are all structured differently but 3 recent ICO's have been managed by the Goblin team and I have to say they have done a great job. Currently they have 2 active bounties Asura Coin and Spotcoin and you can register using this link
http://www.g0blin.com/ join Spotcoin Bounty Telegram
https://t.me/spotcoinbountySpotcoin will have their Pre-ICO June 12-June 14, 2018 and will announce public sale soon.
Pre-ICO details
https://medium.com/spotcoin/time-to-take-action-exclusive-spot-pre-ico-sale-opens-tuesday-38132914f597 and instructions
https://youtu.be/pKBbc7BWFy0Spotcoin has a very good team of professionals that are very active within the community. They also spend alot of time educating about blockchain and will start the Black Sea Blockchain Institute in Tblisi, Georgia. Offering accredited classes to those interested in a blockchain career.
Spotcoin was founded in November 2016 opening a wholesale crypto/fiat OTC, with over $10 million in volume for 2017.
They will expand the OTC and add a digital crypto exchange, Spotpay and a mining facility.
You can register at Spotcoin so you are ready to register for public sale whitelist when its announced.
https://www.spotcoin.com/ref/9faac01a-2d41-11e8-9fe8-0e2c9ce2c3c8 you can also access the whitepaper to learn more. If you have questions about Spotcoin, join their telegram
https://t.me/spotcointeamAsura Coin is currently having their crowdsale, register for whitelist
https://asuracoin.io/There Bounty is still going on and you can register on Goblin website. There are several tasks available so you still have time to earn free ASA.
Asura Coin is a platform for gamers that allows you to play against others with similar skill sets. You can place bets and if you are the winner you will earn ASA. You can also vote on which tournaments you would like hosted on Asura Coin platform, and if you want to improve your skills they offer guides and other information provided by professional players.
Join Telegram if you want to learn more or have questions
https://t.me/AsuraCoinSome other current bounties for NEP-5 ICOs
FTW Coin-Current Sale
15% Bonus until June 2 then goes to 10% bonus
Website
https://www.ftwcoin.io/feel-lucky-today/Xix96h22ufvtYZXi3Telegram
https://t.me/ftwcoinAirdrop
https://t.me/FTWAirdrop_bot?start=488794570Epiphany Bounty
Website
https://www.epnex.io/sign.html?i=00JdxzeTelegram
https://t.me/epnexSafeguard-Current Sale
Join Bounty
http://queue.vip/5jAnGQwSenno-Current Sale
Join Bounty
http://vy.tc/fARLn90Join token sale
https://senno.io/?ref=174&subid=For updates about NEP5 bounties and airdrops join
https://t.me/thepowerofneonews