I think one of the reasons why bounty campaigns nowadays are extending because of only few are holding their coins and it makes their capital low. Once a project requires more advertisement so that more investors will invest, then the project manager thinks the only way to survive the project is to extend the campaign. Other cause are scam project that makes investors to think twice or more before they will get involve in s project. Which it makes the legit project are difficult to differentiate with the scam projects and it will make low soft cap in their ICO projects. These are only my opinion, I hope it will may help everyone here.