I wouldn't even know how to begin to answer that: federal agencies have saved investors billions, if not trillions of dollars since they were created by Congress ~100 years ago.
Give me an example of a law. You're the president. What does become compulsory as a process if I want to run a cryptocurrency exchange that would ensure the customers' funds are insured or more protected against a hack?
Meanwhile, if the core devs of Bitcoin collectively decided to increase the max block number, then they... could. I'm not saying this is likely to happen, but in the case of Bitcoin it's up to the decisions of a group of unelected, unaccountable entities.
This is certainly not the case. The developers can write any code they want, just as we, the individuals, can run any software we want. If a group of people change the 21 million limit, we can simply refuse to run that. There have been many instances of Bitcoin developers trying to change fundamental parts of Bitcoin in the past, resulted in altcoins nobody even remembers anymore.
And lest this seem implausible, I'll create a simple scenario for you: in 2025, President Trump wants pay of the US national debt with Bitcoin as he promised to do so in the campaign, so he orders Satoshi's blocks to be released (through a change in core to specifically hack them). Core devs of Bitcoin do this or become international criminals, so they comply.
So, they agree to write the code for Trump. They do. The next challenge: convincing the entire network to run those binaries. This is a process that is orders of magnitude more difficult and fundamentally different. There must be consensus on the new fork, or it will be rejected. In other words, defining what Bitcoin is lies beyond the authority of just a few developers.
Edit:
(* Fun fact: I never use the word "fiat currency" to describe national sovereign currencies because it doesn't differentiate them from digital currencies: they all obtain their value purely by virtue of their subjective human demand, so all digital currencies are "fiat" currencies).
Not at all. Fiat currencies hold value because governments, with all their military power, declare them as legal tender. This goes far beyond the subjective human demand that applies to things like bread, houses, or Bitcoin.