Is it normal that projects will not pay bounty rewards because their sales doesnt reached the target?
yes, it's normal.
Is the bounty manager will be liable to here even its not in their control that ICO failed?
they just have task to manage bounty, if the ICO failed they wont be responsible
I want to joined Soc Med campaign but I read somewhere that some projects really dont pay at end because of ICO failure.
many ICOs failed mean that many bounties dont get reward too