In ham radio command and control over remote digital ground stations all have clear text passwords because it's against the law to encrypt on ham radio bands. So every password is a single use.
Today, if I connect to the digipeater that is near me I will use the password S4tA12fDg
and it will work once and only for a certain window for that single login to happen.
Any company worth anything would do the same. Here is your link, here is your one time use password, you had better get the file in the next 20 minutes or that password will not work.
Perfectly secure for simple crap that really has zero value like a school transcript.