> Are the courts not US government?

Generally speaking, we tend to refer to governments in countries with independent judiciaries as being separate from their courts. The same way we refer to the government in parliamentary democracies separately from their parliaments. (Or governments separately from a country’s people, even though one is a subset of the other.)

> Do you think there isn't any collusion between Supreme Court and the other branches of government?

Not super relevant here. This SCOTUS barely upheld the ban with Bytedance as the owner.