I think the problem is determining who is contributing, intention, and those other nuances take a human’s time and effort. And at some point the number of contributions becomes too much to sort through.
The LLM providers will be laughing all the way to the bank because they get paid once by the people who are causing the problem and paid again by the person putting up the "barriers, processes, and mechanisms" to control the problem. Even better for them, the more the two sides escalate, the more they get paid.