I think It is fair that the members of a family, that are a community living together or not, all share in the burdens of life so it is easier for everyone. But if the parents are like forcing you to pay rent, then I would just live somewhere else.

Put in another way. It is fine if you have an adult children to say “hey, help out anyway you can so it is easier to everyone” and if they cannot figure out how to do that or they are like stuck and not progressing in life then instead of an ultimatum of “pay rent” better is a “I think you need the experience of living on your own”. Again I am all for money staying in the family and much prefer that or even better they saving money to buy a place than paying rent to some shitty landlord. But anyway.