It doesn't work like that: the individual is engaged in an activity in a society, not on an island alone. If an activity would typically be considered a work f

It doesn't work like that: the individual is engaged in an activity in a society, not on an island alone. If an activity would typically be considered a work for compensation by society's norms, it's not reasonable to call it a hobby. A person can write software as a hobby (personal use, or maybe use personally/within a small circle of friends) and, at the same time, write software for use by others in commercial endeavors (work). The fact that they may not do the latter in exchange for money doesn't make it a hobby.