There is absolutely nothing wrong with this (in fact quite a bit is right with it) as long as they have ensured that any of the original owner's data has been w

There is absolutely nothing wrong with this (in fact quite a bit is right with it) as long as they have ensured that any of the original owner's data has been wiped. Re-using is far more environmentally friendly than recycling since rather than a fraction, 100% of the device is effectively being recycled.