What is rich people collaborating called? You might claim that it is incompatible with capitalism but it’s just a fact of it. It’s easier for a small number of resourceful people (and capital gives them resources) to collaborate than for many people with not much more resources than their house/mortgage. This is what Adam Smith told us anyway.
Simply assuming that "every employer does it because theoretically it is easier for then to do so" to help your argument is rather self-serving, considering that labour unions are explicitly legal and exist.
