Most bounties don't really take up too much time, it's very unlikely that you would have spent more than around 10-15 minutes per day on the bounty, even that is unrealistic, probably 5 minutes per day for the most part. There is nothing you can do, a lot of ICOs simply fail, and hence will not pay out their bounty, or if they turn out to be a scam, nothing you can do either. That's why you should be participating in multiple high quality bounties at once, so it's unlikely they will all fail.