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* The titanic carbon footprint.

* Its use in facilitating illegal transactions.

* The fact that unlike cash it's used (as opposed to speculated with) for little else other than illegal transactions.**

This pretty much covers it ^^

** Yes, I'm aware. Not all prohibited transactions are bad. Donating to wikileaks is good.

The fact it is used for not much else other than illegal transactions would seem to me to be the biggest risk to its value. Regulatory crackdown will be coming sooner or later and when it does, there's gonna be investor tears.

These are the ones who told us the financial instruments that crashed the world in 2008, had negative externalities, before they had crashed the world.

Seems plausible that these particular ones would be prepared to both spot, and tell us about, another impending disaster.

Ironic right?