Governments and their banks.

If Bitcoin or crypto over all gets the expected popularity among people, the income that governments are earning from their banks are going to decrease significantly and the more crypto payment methods people use it's a money out of their(governments and banks) pocket.

You pay a lot of fees in the long run for services that you get from banks all the while they are lending your money to bigger corporations, while in the crypto what you spend is only in the form of transaction fees which will be paid to miners which using their hardware capacity and use their electricity to mine that coin.

If a day comes that most people around the word are using decentralized coin/s for any kind of payment then governments and their banks will be losing out on a good portion of their income which will eventually lead to removal of traditional banks and replacing them with crypto, but I'm guessing before that happens governments will be trying really hard to push their own created coin so they have some control over it.