Yes, it's probably actually necessary to introduce some kind of limit to protect the server against hashdos-type attacks. Sadly though, Occam's razor suggests t

Yes, it's probably actually necessary to introduce some kind of limit to protect the server against hashdos-type attacks. Sadly though, Occam's razor suggests that the "20 char" limits and ridiculous "alphanumeric only" restrictions are caused not by some advanced considerations but by something much more stupid and incompetent.