Originally Posted by diba
It is not about modifying the system as such, but what you are doing, is getting an advantage without being willing to pay the price! Modify whatever you want, but is unethical to block the ads, if you got the device cheaper, part of the "contract", thats it!!
No, it isn't unethical. If anything, it would be copyright infringement to ban users from altering the underlying software that was not completely created by Amazon. Amazon chose to use GPL Software to power it's devices. Many people worked very hard developing that software and gave the legal protections to everyone so that they could modify, redistribute, or alter it.
GPL != Free to take and obtain exclusive rights to.