Would people choose the bounty based on the trust rating? I doubt so, people check hype, team and mature bounty hunters research about the project first. I see BMs with a negative trust and still running the bounty campaign. They are probably connected with the team or simply doing an excellent job despite the trust. Funny though they only accepting people without a negative trust in the campaign, clearly a double standard.
I definitely agree to you, why should we based on trust rating, seriously? as of now there are massive scams today. The reason why, there are known bounty manager being paid by some ICO to post their promising scam project. Some of them have +trust but doing some fishy things without us knowing it. There are talks behind the devs and the managers. Therefore, it's hard to trust ICO now, it's a full of scam.
Green thingy are just designs, there are also high rank members with huge number of trust are being paid to create fud and accusations to the opponent project. So now if there is someone who disagree about this tell me something that proves i'm wrong.
Note: im not referring all ICO are scam, there are great ICO that has a true goal.