There will always be a company that delivers products according to the minimum regulations required by law - that's how capitalism and competition are meant to work (given a near-unlimited labour supply).
Correct. But in this Imaginary scenario it will Certainly be more expensive than current amazon. Is that more acceptable, to say the poorest in society, than bad worker conditions?
The poorest in society, at least in a functioning capitalist society, are those either employed according to the minimum regulations or those receiving state benefits. By raising both of these, we raise the purchasing power of the poorest in society, hopefully in a way that is commensurate with the increased costs.
We are able to provide both good working conditions and a living wage to all people. We can afford it.
