That’s why you buy through a bank. Edit: I am wrong. You can only buy it two ways which is ridiculous in my view. More to the point of the website that belongs in a museum, why can’t they update this consumer facing portal? What happened to all the people from “digitization” govt organizations? Such as 18F and usds. Oh. You mean all they do is replace the front end? Got it.
Personally, I didn't even know of this portal's existence until I signed up for an account and and went through the same process the author went through. I noted the same security theater and passed it over to my USDS team to see if there's anything we can do.
At first glance, simply replacing the front end is a solution, but there are bigger problems here that the author did not try. If one tries to change your bank account number, having typed in it wrong, they'll have to mail in a physical form to have it changed. As the author noted, going over $10k per year will also trigger unintended consequences that can span 8-10 weeks before the money is returned.
There are problems here that goes beyond just replacing the "front end".