Of course, escrow is important but more important is to find out if the project is legit and it would worth it to waste time on it? and if yes make sure that bounty really belongs to that project or somebody wanted to make a fake thread about it?
and if you found out all of them then you need to see the pool price, some of the pools are too small to join, and it is very important that the number of participants is limited, I really don't like it when they use stake instead of real numbers and tokens from the beginning, doing bounty could be worth it , if you are doing it in the right way.