Making research about bounty campaigns before taking part in it is very important and useful, so that one will not waist time in a project that will not serve its purpose.
Things to look out for will include; social media platforms, how active it is and how many followers they have, the website of the project, the project team, how active the team are on its official telegram group. Taking time to read the white paper of the project will also give an edge of the projects authenticity.
One more thing, scam projects do end up removing its users and deleting its official telegram group and channel. Projects that dies such are scam project, but we should also know that there are some projects that could not get to the price of their softcap and that might be a reason for the project not be able to complete its needful and success if the project.