Im no expert here,but I cam share a few or support a few notes posted here.
What I do is to check their background first and do some reseearch, then check their roadmap or products that support the project. A very good laid out plan usually have products.
Then I forgot, as part of background check, we can look for their visibility in social media. A project that has nothing to hide, transparent, has visibility all over

nice question from you, I know as bounty hunter hard and difficult to find better project, because even the scammer's the roadmap and the white paper's looks like legit project but not, so find legit project you need to read all detail's of the project and search the team member's of the project if they have good reputation in this industries.

Do a background check not only to the development of the project but also to it's developers team, check if they already had a successful project before. Communication is important because there are some announcement that has to be read for the participant to inform about the project. Bounty campaign it hard to find which is legit and give better reward. Be a researchable participant.

Read before you enter, read thier white paper you must know what is there project if it is legit or not or see who supported this ICO join in bounty with trusted managers and high ranked member then see the spreadsheet who is joing the bounty and more research about the bounty your joining.

First i check the bounty managers, second the project and it's whitepaper and thirdly I look to see what's involved in the bounty task and how much it's paying. These days with huge numbers of people now doing bounty campaigns you need to make sure it will be worth your time and effort.

To evaluate a potential Bounty program by the following factors:
- The level of staff, who have a reputation in society.
- Roadmap and Whitepaper are clear
- Potential business ideas in the future, the idea is to keep up with the trend of the market
- How many Tokens are released.
- The community on the internet is real.

indeed today many bounty campaigns for a peroyek. but we do not know which one is good and which is not. sometimes the ICO project is running is not guaranteed. if I am in the clay used bounty managers who have often been proven or have often given a good bounty project is not a fake at the end of the project. in essence we must first understand and read the description of the project content is good or not.

In choosing a bounty , you to check first the ICO itself (read their whitepaper and research on the team itself. Then check the bounty pool and the budget for each campaign. Check also if its is handled by trusted campaign manager here in the forum and lastly check if there are plenty of rank up members (senior member  & up) who are joining the campaign because thet are more knowledgeable than we are.

When i looking for a bounty campaign, there are a lot of factors i look before i join. So first of all, it have to be a good project which i believe it could have a bright future. After that, it has to have normal requirements. So i dont particiapte in signautre campaign where i ahve to make 30post per week, because thats to much for me, and thats the reason why so many people start spamming on this message board. Also a important thing is, how big the bounty pool will be. So if theres a small bounty pool but over 1000 participants, you will just ear s small amount of tokens or coins.