What cloak and dagger?
Congress doesn't just cut a check every time they allocate money, there are offices that oversee and implement the spending. When a government agency or non-profit applies for a grant it goes though an administrative middleman, not straight to a congressman.
How much time have you spent in federal government?
You have no idea what the funding processes actually look like.
Every high-level agency gets a discretionary pot of money to spend on anything they see as needed but not otherwise funded.
Once Congress and the President pass a budget, the money is allocated by law. Any middlemen are just accounting and finance workers who dispurse the funds to organizations whose leaders then allocate the funds down to subordinate organizations to fund activities.
In the case of USAID, the money is sent directly to that program. The people running it decide who gets how much.
You seem to have this misconception that there are people like Musk in the process making sure funding has a person or section that oversees the money to make sure it is spent responsibly. That perception is totally wrong. The only oversight is AFTER THE FACT, where someone who cares about the duty to be responsible sees what was spent, how it was spent, and why it was spent. Then they can question whether or not any expenditure was reasonable and justifiable. Most don't care. As long as the books balance, they have done their job.
If your naive belief was actually true, people providing oversight would have been able to account for the trillions that have gone missing over the years. So, please don't pretend to lecture on how appropriations and funding processes work.
The proof nobody is providing adult supervision is in the results.