Short checklist for bounty:
1. Bounty Pool
Focus on the dollar equivalent. The bigger, the better. But a large pool is one of the indirect signs of a scam.
2. Number of participants
Less is better. Take into account, together with paragraph #1. For example, if a company has not a large pool, but the people in it are few, then you can make good money.
3. Already invested money in the project (if ICO started)
If in the first days (I limit to 1 week) the amounts are insignificant, then it is better to abandon this project, because it is unlikely that the situation will radically change by the end of the ICO
4. Bounty manager
A lot depends on him. The forum has a lot of information about them. Personally, I like Amazix team
5. Activity
Look at the activity in the ANN topic, in the Telegram channel. The higher it is, the higher the interest in the project.
In fact, the selection criteria are much larger, but these 5 points will avoid explicit scams
Would be interested in the the rest of your selection criteria but these are good to start with. Something that people do not look into is the form of payment. Many projects just pay with their token, others share the amount of ethereum that is collected. I prefer pretty much the 2nd option as you don't have to sign up at some crappy exchange just to trade your rewards.