The average bounty allocates the most tokens for Twitter, Facebook, Signature, Youtube and Article campaigns.
is there a bounty that allocates higher tokens to the Signature campaign?
There are some bounty projects that exist which allocates higher tokens rewards targeting signature and twitter campaign for a total of 100% but those project are applicable only for higher ranks on thread can do participate the said project.
maybe they find it more effective to promote through top ranking signatures and twitter. and as a bounty hunter, of course, you can only obey the rules that have been made so that later you will get your rights. but sometimes we can give feedback to the bounty manager to recommend a lower rank, in order to participate