What a bunch of BS. Once I buy a product I can resell it elsewhere. That's how ownership works. I do not need "permission" for this, beyond that guaranteed by the legal system, and exceptions such as export restrictions notwithstanding. There is a term for this that currently eludes me (first sale doctrine is a similar concept but not exactly.)

If I was a seller, I'd probably find this a good thing --- Amazon is effectively giving me more customers for free.