There are a lot of laws in the US that force me to do something. Twitter cannot force me to do anything. The only thing any of my employers could force me to do was leave the premises if they didn't want me anymore.
As for Visa issues, your complaint should be with the US government, not Twitter.
Consider a situation where I want to invite someone to visit me on my property, but some government also claims jurisdiction over my property and decides that person is not allowed to visit my property. Whose property is it again?