before Joining any bounty make sure to study first the ICO bounty that you are interested to join . Check also the campaign manager that is handling the bounty if he/she is one of the trusted campaign managers here at the forum. Check also if there are many higher ranking members of the forum that are joining the campaign because this means that the ICO is good since higher ranking members are more knowledgeable than us.
yes I agree, keep in mind that when joining a bounty study first the platform, see also the roadmap, the team itself and always see if the campaign will be successful in the future.