I disagree, Bitcoin is use public blockchain, so any transactions made by the corrupt leaders will be shown on the blockchain. Anyone can see that, if they want to corrupt, we will know how many coins are moved to those "suspicious address" and they need to prove it.

Unlike fiat, it's recorded on private ledger where they can manipulate the information.

Bitcoin can be both solution, solution for people to escape from corrupt leaders or Bitcoin change the corrupt leaders.