If you are actually in a different country than States, then usually there isn't a lot to worry about that. I doubt US would go after 1 such company, as there are more than 20 such companies which have dice. Bitcoin gambling has a very less chance of being regulated, as a company based in Russia can't be regulated by US. Same if for other gambling sites.
Actually I am from Europe and unlicensed fiat books are regulated here like in the USA. The thing is you can visit only the licensed sportsbooks and everything else is filtered. If you got caught you will face years in prison and a big fine.