But they don't really solve any of that.
That are inefficient too, slow and costly. 51% was possible from China anytime until they banned it. Insane workarounds are proposed for easy problems.
Instead of the SEC, some sharks/influencers are ruling the markets. Not a week goes bye without a new hack or malicious ownership of the cloud solution or an on purpose malicious contract or extreme scams ( eg. Tether, USDT, ...). Within a second, all their money is away.
People just hide money with currencies that hide their money trail.
The nr. 1 problem for access to banks is internet access, look at El Salvador. They are suddenly creating internet access that hasn't been there before, creating a fake dogma. They had access to banks, it was just a long drive away. Transferwise could reduce transfer costs, but a big problem is also a faulty governement or eg. In case of Libanon: stable electricity. Crypto doesn't solve any of that.
In the end, it's all about the hype and a lot of the end-users don't understand how it works and aren't protected from their own stupidity.
Which is exactly where eg. Opex helps.
Ps. Copy pasting your answer without a minor edit even just shows how mindless this thing has become.