I guess it's a free world, no one is being press ganged into this position.
I think the most disappointing part about this is voluntary work is usually for a good cause you know to benifit some disadvantaged sector of our society as just an Eg not to line the pockets of some private company & or individuals.
Lets see the profits from this venture go to some organization/s that assists perhaps young pilots thru a well set up scheme whom might have the aptitude but not the funds.
As 'MEA' said it's very astute of them & seeing it's a business operating within the law then anything goes !
Wmk2