There is a saying that describes what you have experienced, “to gain indulgences with someone else's scapular”, means to take advantage of the work or effort of others to obtain a benefit, without having personally contributed to it. It is a saying that criticizes the idea of receiving recognition or reward for something that has not been achieved by one's own merit, but by the help or work of others.

I feel totally identified with you, because I have lived it and now I don't do that kind of things, I know it sounds like being a bad partner, but each one can take care of what corresponds to him/her.