I think as with all crypto projects it's important to do DD and research, especially communicating with the projects' team members or moderators if any on their social media platforms or telegram groups etc. The problem is when you join too many bounty campaigns and have a bunch of coins that you are unable to follow up with - so make sure you're really confident in the project before trying the bounty out. Usually there's an accompanying official telegram group as well before you join the bounty, so you could find out more in that chat first before joining the bounty! But one of the cons of bounty is that you don't get the tokens immediately and must wait for it to be distributed after the campaign ends, and some people like to get the tokens immediately.