It can't be anti employee. Employers don't pay more for employees with non competes they pay less. In the case of the fictional employees you mentioned previously both employers would have faced a more competitive market for employees resulting in higher wages.

The non compete is nearly entirely valuable in that it it depresses wages. In reality its entirely likely that between firm A and firm B neither has a whole lot of special sauce non competes mostly serve to keep each other from competing for employees thus driving up wages.