Online banking and cryptocurrencies are not equivalent technologies. Just because you can solve those problems with software doesn't mean you can solve every problem in the world with software.
Yes they are not equivalent, my point is that if we can handle money online, there's no reason that voting can't. Bitcoin's market cap is something like $80b, yet nobody has ever hacked it.
Correct, online banking is in the stone age compared to even the crudest cryptos.