I certainly agree with your sentiments, but I thought that Amazon had also had problems, with contractors in its fulfilment centres being denied guaranteed hour

I certainly agree with your sentiments, but I thought that Amazon had also had problems, with contractors in its fulfilment centres being denied guaranteed hours, though perhaps I misunderstood the issue. There have certainly been problems like that in the UK, with "zero hours" contracts, where people are offered positions without guaranteed hours, and it is currently a fairly hot political topic without an obvious resolution, beyond banning them, though that wouldn't necessarily be helpful. Personally, I think the fundamental issues in this area lie not with the flexibility that these types of arrangements offer, but rather in the asymmetry in negotiations between employers and employees. The labour market as a whole is completely distorted by poverty, for want of a better word, to the point where any notions of free exchange are, frankly, ridiculous. If the collective "we" can implement a way of preserving the ability of people to sell their labour without being placed into unreasonable positions to do so, then we could probably achieve quite dramatic improvements in overall welfare. Until then, as you say, the costs of the system will almost always fall on a group of real people whose difficulties, beyond the occasional editorial piece, are largely ignored (or attributed to something else, such as laziness).