Can you report an incident of either an arbiter throwing the book at a player who constantly produces illegible score sheets? (Also think of the poor tournament bulletin redaction.)
"Throwing the book" is generally counterproductive to generating long term change. If you have to officiate regularly where a player produces illegible scoresheets then you have to use more persuasive techniques to generate the desired change.
The one case I know of where this worked involved a strong local player who produced scoresheets which didn't even allow you to make a reasonable guess as to what was written and a very senior arbiter. She often officiated in tournaments where the games were submitted to FIDE in which he often took part and so she often had to deal with his scoresheets.
Sitting him down and asking him to read his own scoresheet sort of did and didn't work. Of course he couldn't read what he had written but he was a strong enough player that he remembered the game perfectly anyway.
He is the same generation as me and so grew up using descriptive notation. What she did when she "persuaded" him to start recording legibly was to, firstly switch from descriptive to algebraic. I had to input one of his games once (fortunately his opponent's scoresheet was legible) and I didn't know he was using descriptive! That's how bad his writing was.
Second, she got him to slow down. Apparently as part of her effort to coach and train him to write legibly she noticed that he was scribbling at high speed and realised she needed to get him to slow down. Kudos to her because now his scoresheets are legible although still far from copperplate.