The Gates foundation has an endowment of $49.8 billion. That isn’t annual additions. That is all the money.
The US federal govt spends $85.9 billion a day. That is just federal, not state or municipal.
https://datalab.usaspending.gov/dts/?start=20210330&end=2021...
The US alone could very easily set up a foundation with similar funding. What makes the Gates Foundation special are the ideas and networks of the creators.