This is a project idea for someone who can spare some time and wants to earn monero.
There are lots of cheap kindles available online, but most of them are locked into amazon services. They would be much more valuable if they could read arbitrary pdf and epub files. However, selling jailbroken devices is often against the terms and services of online sales platforms. The solution would be to sell them on xmrbazaar.
So your project would be to buy cheap kindles, jailbreak them, and sell them on for monero.
This idea occurred to me because I was trying to jailbreak a kindle and found it a pain in the ass and wish I could just buy one already unlocked.
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