The system would have benefits for forum owners as it prevents both spammers and trolls and makes it harder for people to make shill posts using aliases thus increasing the signal to noise ratio. I don't agree that one mark against a Truyoo member should disqualify them from ever entering any other Truyoo enabled forum, as arguments arise on forums readily. Moderators can be punch-drunk on power and ban users flippantly even though they might have been in the right.
Rather, it should go on their record like a credit rating. Other forums can choose whether to accept or deny them entrance. Truyoo users should be allowed to explain themselves too in comments on their profile against any mark. They should also be able to choose to set different user names for each forum for privacy. Their true identity and aliases should also be kept secret from forum owners. Perhaps they could pay a premium for this - the $2 or you could add a zero.