[blodovnik]

So why haven't all websites cut off these countries?

Why haven't the ISPs cut off these countries?

Github has acted because github is under the control of a giant corporation, Microsoft or otherwise.

So there's a line that runs precisely from Microsoft acquisition to cutting off countries from the world's largest open source repository. It's a direct outcome of the Microsoft acquisition.

[viraptor]

A lot of pages have. Or at least they don't take payments from them. Larger CDN providers will maintain "US sanctions" blacklists which you can enable with one click. A lot of companies just don't care.

[mugsie]

I doubt it - I would suggest the rapidly escalating tensions in the Gulf, combined with a much more activist / impulsive administration has caused this.