I want to ask how does the people that do bounty make money.I mean they are giving away money for free.How is it profitable for ICO teams?
Because very less amount of people invest in their ICO through bounty.

It is solely for fund raising project it is possible to get tons of profit by giving the coin some exposure in the internet specially on social media although signature campaigns has high chance of exposure to this forum since most of the user in this forum tend to invest on such things.