Because they shouldn't start their own union. Unions are across companies, having a single union for a single company doesn't make much sense. Take the UAW, the

Because they shouldn't start their own union. Unions are across companies, having a single union for a single company doesn't make much sense. Take the UAW, they don't just cover General Motor, they cover all workers in that sector, giving them more power and influence. It's the same with a Star Bucks union, that's silly and not cost effective. You have a "restaurants (and cafe's)"- union. Take McDonalds, they have an agreement with a union in Denmark, 3F. 3F covers fast food staff, construction workers, factory workers, paramedics and many more. They are hugely powerful.