Well, I would think it is respectively coming down to the operator of the sites but don't nail me on that...but on a side note, I wouldn't plan on host gambling sites on a .us server anyway...?.
The Top Level Domain shouldn't have anything to do with it. Your best bet would be to consult an attorney since laws involving the Internet vary quite differently from country to country...
Another thing to consider, in addition to where you physically are located and the hosting location, is who will have access - this in my view, is the most important part...
Many gambling sites, even those located and operating off-shore, have been targeted by U.S. law enforcement for offering such services to people in the U.S.
Adult services have faced similar issues for decades (including BBSes back in the 90s, and mail order sales) in regards to the laws of where the users are located being applicable to the adult service operator; "local community standards".
And in such situations, disclaimers / TOS alone likely isn't enough - necessitating the need for aggressive user screening, including verifying the user's street address along with IP geolocation to filter out those users who aren't legally serviceable.
And finally, the poster above me is spot on ... consult an attorney, preferably one who specializes in on-line / internet related legal issues.
IMO there are many points to consider:.
- each ccTLD has it's own rules.
- most importantly your personal jurisdiction (you can be sued where you live).
- who has access to your services, as pointed out above - some countries, the US in particular, will be quick to assume jurisdiction if their own citizens can have access to your services..
If your sites are hosted in the US then the hosting company is subject to US laws. If they receive a complaint that you're in violation of US law, they can shut you down. So can your registrar, if the domains are registered through a US-based company.
I also recommend you consult a lawyer on this...
Different TLDs have different regulations, especially ccTLDs. However most regulations are related to who can register under a certain ccTLD and TM issues. In general most TLD administrators do not restrict content on the but you would have to look into the specific ccTLD rules.
Anyway if this a serious business you should get professional legal advice...
You, your hosting and your customers need to be in a country with legalized online gambling.
The rules of ccTLDs vary. I saw someone here on NP recently say that they lost a .us domain because it had the word tit in it...