Popescu's best buddy the Frenchman pankkake is also in this deep. He has taken money from MP to carryout attacks on all things not MPEx. Pankkake knows enough to put MP behind bars for blackmail, extortion, commercial attacks. If the FBI put pressure on pankkake he will talk.
For his commercial attacks alone Popescu could be fined up to 30% of his annual turnover/sales under EU law. That alone would bankrupt him and his business. He can also face prison (in some EU states) for infringing EU competition laws.
I wonder how far they are into this operation. I'd say they're at least half way there.
There are jurisdictional issues involved here. Contrary to the belief of many in this forum USA law doesn't apply in the rest of the world. The SEC like to claim that they have jurisdiction in other countries where services are sold to USA citizens however there are a lot of steps involved in any extradition process some of which will require a reasonable case to be put forward and that the person will get a fair trial.
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I am not a lawyer but have dealt with data protection on and off for several years.
Typically in a case like this when you are sent a letter, they already have you. I'll refrain from speculating further, I wouldn't want to spoil anything.