This is very easy to find with a simple google search. Here's the year-to-date spending for 2023:
$1.01T social security
$673B health
$636B medicare
$623B income security
$610B defense
$494B net interest
$220B veteran benefits & services
$201B education, training, employment, and social services
$89B transportation
$74B community and regional development
$179B other
https://fiscaldata.treasury.gov/americas-finance-guide/federal-spending/
From what I know there are a number of legal complications/liabilities to hosting NSFW content. For most people hosting instances it's just not worth the hassle given that users can still interact with the NSFW communities on the dedicated instance.
That kind of discrimination is generally illegal, even after the recent supreme court case.
What the ruling says is that some kinds of business, such as designing a website, decorating a cake, or writing a song, for example, are considered speech. In those cases the right of the designer/decorator/songwriter to control their speech takes precedence.
However, this doesn't mean you can kick someone out of your restaurant for being Jewish or refuse to make a non-marriage related website because a client is gay. It's only cases where speech is involved.
The executive branch includes the president (who is elected by the whole country) and their staff, as well as the various departments and agencies such as the FBI, USDA, NASA, etc, which are staffed by unelected government employees.
The legislative branch (Congress) consists of representatives elected by the people of each state.
The judicidal branch is the courts, and the Supreme Court is the highest court. Its 9 justices are nominated by the president and confirmed by a vote in Congress, and serve for life.