I think what they give is very fair, but if finally bounty participants only get cent it is not because the project is unfair but because the market does not see the potential of the token so the price becomes cheap. It would be unfair if they changed the amount of token allocation to be distributed or stalled the division time.
That is why you have to be careful in choosing bounties but unfortunately bounty participants mostly use multi accounts and will only cry and blame the project if it gets small without realizing that the mistakes in those who are not careful.