Some followers are cloners, emulating the leader’s products, name, and packaging with slight variations. Some are imitators, copying a few things from the leader but differentiating themselves on packaging, advertising, pricing, or location. The leader doesn’t mind as long as the imitator doesn’t attack aggressively.
Some followers become adapters, taking the leader’s products and adapting or improving them, perhaps selling them to different markets.
Note that these three follower strategies are very different from the illegal and unethical follower strategy of counter-feiting. Counterfeiters duplicate the leader’s product and packages and sell them on the black market or through disreputable dealers.
What does a follower earn? Normally, less than the leader. Some follower firms have found success, but in another industry.