Earlier quoted context omitted.
What would this involve? And can't they buy equity with their salaries if they wanted to?
Usually my employers haven’t let me buy as much equity as I’ve wanted to, they severely constrain the employee equity pool allocation and dole it out as occasional rewards and reserve most for non-worker investors and owners or executive roles. For how it could work you can look at worker-owned cooperative structures, sociocracy, etc
The one customer owned cooperative I have worked for did limit equity to one share per shareholder, in addition to being the most pathologically corporate and political company I have ever worked for or known off. Maybe worker owned cooperatives work better.