On many Russian websites (including some pirate online libraries where you can read/download books for free) one can find a message saying "if you find somethin

On many Russian websites (including some pirate online libraries where you can read/download books for free) one can find a message saying "if you find something misspelled please select it and press Ctrl+Enter to report". I have never used this facility as I'm hardly too literate in Russian and have never found anything looking like a mistake on such sites (perhaps because others have already reported all the mistakes) but it feels odd I've never seen anything like that on non-Russian websites.