If I created it in my country the way they hate freedom they make complicated regulations so the state prosecutor can put anyone in jail that he wants. So lets say they track me down the state atorney could be me in jail for money laundering, terorism (supporting it with the alt coin) and many other things. I heard of the fhe former parlement mebers say every citizen is a crimnal because we make the regulations that way. So in my country it's not legal i'm 100% sure!
Unfortunately the law in some countries, especially the USA is very vague because states and districts have their own pace of writing and modifying it. What's legal in one state can be illegal in another and sometimes they even ignore the rulings of other courts in similar cases.
The money transmitting law and the law about possible terrorist activity and money laundering are misinterpreted and used to pressure people into paying fines and financing the flawed system. If you look at from this angle it seems they can come at you at any point, and it won't matter if you're issuing your own altcoin or trading an existing one.
That said, in most countries the authorities ignore coins and don't require you to register them, as long as you pay the taxes.