The customer who trains the system may never own what their effort taught it.

Every correction, rating, and reported problem improves a system, and the improvement belongs to whoever owns it. The person supplying the effort is usually described as a user, and the value of their accumulated contribution is not something they hold any claim on.

It is worth being conscious of when you are working for free and whether you are getting something proportionate back. Sometimes you are and that is a fair trade. The point is to notice the exchange rather than experiencing it as simply using a service.