Surely "the right thing to do" includes some element of the authors' explicitly stated preferences about how they wish to be treated.
In this case, they chose -- explicitly -- to NOT require any payment or contribution from anyone.
Your feelings about what constitutes "the right thing to do" are apparently different from those of the authors. You believe you know better than they themselves do how they should be treated.
In this case, they chose -- explicitly -- to NOT require any payment or contribution from anyone.
Your feelings about what constitutes "the right thing to do" are apparently different from those of the authors. You believe you know better than they themselves do how they should be treated.