I notice that some coins that are already in the market are doing bounty campaign again like Credits, Veil Eterbase and among others, do you think it's important for a coins/tokens that are already listed to run a bounty campaign from time to time even if they are already listed in exchanges.
It's almost an money airdrop, which the project spends on advertising and attracting more communities. They spend money for the bounty hunter to grow the volume traded for that currency.
From the perspective of the project, it is not really necessary. The view of bounty hunter is amazing. What's more than a bounty that will definitely earn money from it.