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.
Bounty campaign is basically a form of advert or promotion of crypto projects, products or platforms. There is nothing wrong if an already listed coin decides to run a bounty campaign. This is just a means to promote their product or coin and also increase the number of users that patronize their product or platform.