So you wanna say people who didn't get accepted on high paid campaigns broke the forum rules and that's why they are not being accepted?
No, and I never said that.
If you aren't getting accepted to a high paid campaign, it is because there are other people who, in the eyes of the manager of said campaign, are making better posts than you and are taking the available slots. If you want to be accepted to a high paid campaign, then you should examine your own posting behaviors and seek to improve them.
Or is it because of the low earned amount of merit, negative trust, and other stupid metrics?
Some campaigns have a merit requirements or a trust requirement. This is entirely at the discretion of the manager of said campaign. If you don't like these metrics, then you are free to not apply to campaigns which stipulate said metrics.