No one needs to pay them. Not being treated like garbage is sufficient.
If the company is treating you as an employee, they are required to pay you. There is precedent for this.
You think those "open or else" threats are taking Reddit closer to that conclusion?
IANAL (oh yes, I do): As soon as Reddit The Company started exerting unilateral control over subreddits and their moderators for business purposes, and not legal or liability purposes, they most definitely were treating mods as employees.