“More than half of the websites in the study accepted passwords with six characters or less, with 75% failing to require the recommended eight-character minimum. Around 12% of had no length requirements, and 30% did not support spaces or special characters.”
Well my favorite is when they accept a 35-character password when signing up but silently truncate your password to those 20 (or however many) characters and just don’t tell you so you have to guess what fraction of your entered password actually became your password.
I think battle.net did this for a long time. I am probably misremembering but gosh whatever service I experienced it with was annoying