[mehrdada]

While there might be broad laws and regulations out there, you have to go out of your way to implement technological measures to restrict access to a certain service. Not all services are created equal: I think it is reasonable to advocate use of services that are more passive in implementing idiotic pieces of legislation and discourage use of the ones that are more restrictive, for whatever reason. It's pure pragmatism, especially when there are alternatives like GitHub. Absorbing legal risks is part of the value a service provides.

Google in particular has been one of the hardliners when it comes to restricting access to users with Iranian IPs. There are other big US companies (like Microsoft, for instance) that are much less active in banning IPs.