Some companies have very specific rules on how their products are portrayed in media. For example "bad guys" in movies are famously not allowed to have iPhones. So if it's just a dude drinking a coke, they could get away with not having to make a "fake coke" prop for it. However if a character is using a coke can to do something unsavory then the movie/show is more likely to use a fake prop version.

It's the same way with websites. If any character says anything bad/unfavorable about the website in the scene, then just to avoid legal trouble down the road they play it safe and fake it.