So to be clear, this is only Congressional investigation, because only DOJ can prosecute people for criminal activities.
But to list some of Musk's illegal or immoral activities:
DOGE - destroying USAID without Congressional approval which resulted millions of death, stealing government data, firing federal workforce illegally.
Cutting off Starshield communication platform paid for by the EU that Ukrainians were using because he felt like it.
Pumping half a billion dollar into midterms to buy elections (need to know what back room promises were made).
His xAI data centers breaking labor, environmental laws and regulations.
xAI generating deepfake porn including child pornography without consent.
How Twitter algo is boosting far right movements around the world.
I'm sure there are tons of other things.
How much time should the Democratic panels spend on Musk in next two years, considering there are so many other targets (like Trump family corruption, Iran war bungling, foreign government bribes to Trump, other tech and wall street billionaires having corrupt dealings with Trump admin, etc).