>If they’re all treating you like an employee, then all of them
But, they aren't. Any traditional employment situation would forbid working multiple jobs at the exact same hours of the day. Any traditional "hourly" employment situation it would be completely impossible to even perform 2+ jobs at the same hours of the day.
But with gig work it's not only possible, but common. I would expect that if these drivers transition from contractors to employees they will be required to sign employment contracts which will forbid them from doing other gig work during their "shift." It remains to be seen if this would be a net positive for drivers.
Ultimately I think there needs to be another category of labor for gig workers. Dependent contractors.