The Frontier and The Western.
What two Las Vegas hotel casinos have made an odd declaration on their signs, that their self parking is free?
Note - The Frontier, up to a few years ago had Free Parking written on their giant arrow sign. Then for some reason, they blacked out the words Free Parking. They just blacked it out.
The only other place where I am aware of such blacking out on signs is the now defunct Golden Palm hotel at Industrial and Tropicana. When they switched from being a casino hotel, to simply a hotel, they sent someone out with a magic marker to black out the word Casino.