I agree with all of the above, but to be blunt, even if they were to go through the congress, they would be approved since Republicans have majority everywhere and they seem to have given a blank check to the President.
We did this to ourselves.
Musk has publicly threatened to fund a primary challenger for any Congressman who gets in his way so, in some very real sense he's the one doing it, rather than the voters who voted for their congressman, perhaps not expecting them to be threatened into compliance by the richest man in the world.
That's definitely possible. Ultimately, it was up to the public of the USA to be the backstop against this and they chose not to.
I think it's worth pointing out that it's not a given Congress would have approved it all. For a start, it would take longer to legally setup the instruments that Musk wanted. Also, the current situation allows Republicans to conveniently wash their hands of any negative consequences. Which is likely a big reason they're not pushing on this at all, as demanding a vote would require them to take a clear side on DOGE.