obviously google knows about this if they're allowing them to run adsense on their pages lol They haven't violated any copyright laws..the search box is provided by AdSense...if they were in violation, Google would be all over them.
Because singular-plural words are considered MISSPELLS but this is not the case for every letter missing. I gave you the ebay-bay example, and there are many more. Sorry mate to flame quickly at you, it is just i have not seen who was the person who posted. If i saw it was you i would have thought twice before trying to say anything in contradiction with you. How is it going bro'?