On the chrome browser vault pages, and probably elsewhere too, the font used for passwords does not distinguish between capital O and zero. They look identical. This is on the "Edit Password" dialog box at least.
Sometimes I need to type the password into another device, so I cannot just cut and paste it. Hence, the characters all need to be unique and easy to read.
btw, if copy/paste the password from the "site password" box into the Notes box it becomes readable, as the latter uses a different font that has a wider character for the capital O.
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