I flipped burgers for a summer between school and university, so did my brother.
I worked for British Rails in-house burger chain, Casey Jones. I didn't join the union as I was only going to be there for 3 months or so, but the job still benefited from union influence - reasonable pay, free food and good working conditions (for burger flipping).
My brother joined the cult that is McDonalds. Half the pay I got, begging the manager for "courtesy cups" of drink these were about half the size of the smallest cup they sell and they didn't expect you to need more than 2 per shift regardless of heat. Anyone who said anything negative was fired on the spot.
It's the American way. Later in my career my British company was acquired by an American one. They thought our Staff Council, which is what we called the Staff Reps required by law was some kind of commie plot. They were shocked they couldn't just sack anyone they wanted without notice. One global team had members in New York, during a round of redundancy they were just moved to zero hours contracts and not given any work. They couldn't even get a new job without quitting and forbidden from working for another company while contracted to their existing one, which of course meant that they were leaving voluntarily and not being made redundant in the eyes of American law.
Amazon and others are exporting their cultish working practices to the rest of the world, only moving the absolute minimum they need to to get away with them in other countries.