Not only does the credit bureau max out their password length, you have a small list of available non-alphanumeric characters you can use, and no spaces. Also you cannot used a plused email address, and it had an issue with my self hosted email alias, forcing me to use my gmail address.
Both Experian and transunion had no password length limitations, nor did they require my username be my email address.
Update: I have been unable to log into my account for the last 3 days now. Every time I try I get a page saying to call customer service. After a total of 2 hours on hold I finally found the issue, you cannot connect to Equifax using a VPN. In addition there is no option for 2FA (not even email or sms) and they will hang up on you if you push the issue of their security being lax. Their reasoning for lax security and no vpn usage is "well all of our other customers are okay with this".
In Germany at least, I hear that banks have weird law requirements for these weird security things, like photoTAN.
I'd be much happier if they'd just let me do my usual setup with password, totp and my hardware token.
In the US the FDIC sets security requirements for banks and audits annually, and they keeps raising requirements every year or so. At this point its just easier for a bank to invest in following current best practices and keep updating to the current best practices than to keep chasing every new finding on the FDIC audits each year
Source: I worked in IT at a bank for a while