In the first Trump administration, people talked about the emoluments clause and all the ways Trump was getting extra revenue from charging the Secret Service for hotel rooms at his properties when they were protecting him, or pressuring foreign diplomats to stay at his hotel to curry favor, etc etc. But the scale of this stuff was tiny in comparison to federal spending and wouldn't show up on any graph of the national debt or the federal budget.
But then he not only got away with everything, the SCOTUS ruling on immunity for "official acts" gives him broad protection for basically anything going forward. If he was directing Musk to use that Treasury Department payment system to send huge deposits directly to Trump's accounts, there would be no consequences. There's no reason not to milk the office for everything he can, and the institutional safeguards have collapsed.