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Now that XMR is discovering its own market niche people will start to form and build an economy around it. This will take maybe a shorter time than it did forming bitcoin's economy in the dark market. But beware to the community of Monero. You have to accept and embrace the fact that XMR might be seen as the "evil coin" used by criminals, illegal drug peddlers and maybe also terrorists to cover their tracks. This could be an impediment or an advancement in its development depending on your point of view.
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Yea if it will be so popular in terrorist world then all exchanges based in civilized countries will be force to stop trading it.
All people who will have open xmr wallet will be juge as terrorist and you will see that masses 10 person per day able to use XMR.
Do you think that any government will allow such tool to exist,they will put in prison for having XMR client in computer.
You will see liquid of XMR hmm bugattis which are sold once per year at dealer if goverment will ban such coin.
Terrorism is good ecscuse for them for more control in USA currently you can go to jail without court for forever because they suspect that you are terrorist.
If they target XMR as terrorist money GL to that coin. Dev will land in prison as well as it was with guys who was developing disk encryption.
They claim that disk encryption is weapon and he went to jail

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You won't hide with your xmr in hole dark net is nice marketing stuff but it can be really death blow at end for coin.
PS: A day when XMR would be popular in terrorist community its best day to sell IMO.
The problem with that scenario: if you ban Monero by name, and do not ban its attributes, you'll end up with dozens of forked coins to take Monero's place--Monero doesn't break any laws, so laws would have to be made (and then designed around) to make Monero illegal, and the more specific the law, the more likely you'll just get a whack-a-mole scenario similar to designer drugs. Plus, you seem to miss that US law isn't world law just yet(China and Russia might embrace Monero or vice versa if countries want to go that route) and it's still impossible to keep people from downloading wallets or creating games that don't use Monero as game currency, but certainly give you the option to deposit XMR, move to a country where it's legal and then spend as you see fit (CK plug).