From their point of view, they might see the rise in a gig-work as a threat against their workers. After all, if Uber and Lyft are allowed to replace unionized

From their point of view, they might see the rise in a gig-work as a threat against their workers. After all, if Uber and Lyft are allowed to replace unionized taxi drivers with underpaid "private contractors" with no labor rights, what's to stop someone else from doing it with other industries?