The question that matters is, is it profitable to participate in ICOs. safety comes after that because it is about your security on your token. If an ICO you have participated is not safe then it would be a waste of time and that would risk your profit. Some are safe and some are not and this is a fact but you could lessen the factor of being scammed by learning and researching first before your participate. Mostly, bounty manager could tell because some values their positive trust that they make sure before they accept to handle it, it must be legit and safe.