I'm unclear on the law or don't understand it when it comes to mining or trading

After reading the news releases on people being put in jail for violations of "Money Services Business" law....I have questions

Can I mine bitcoin? (on the US government site it says it is a violation of MSB law)

Can I receive commission for introducing buyers and sellers of bitcoin - in Bitcoin ? ( Coinbase (or are they a MSB firm?) does this but I'm talking about very large Bitcoin amounts).

If Bitcoin and Ethereum are not securities then is everything else?

It look like the government is random is in it's enforcement of anything.

As a US citizen if I start a company in say Malta or Croatia I the company operates within that legal domain would I still be held liable for business that breaks US law? ( which seems to be anything you do that makes money is a violation of law unless you work for the government or a big company.

Any help or direction would be very helpful. Thanks!!