I've ended up pirating a lot more stuff recently because a lot of services won't set the aspect ratio on the stream properly, so on an ultrawide monitor it displays in 16:9 the size of a postage stamp with both pillarboxing and letterboxing.

Channel 4 (in the UK) is probably the worst offender, as they preserve the aspect ratio, but have it fill the full width of the screen. This results in the top and bottom of the video being cutting off for most TV shows, including the subtitles. They've gone to some effort to make their player run on different aspect ratios, but somehow implemented it entirely the wrong way.

Webrips do suffer from this same issue, but with either FFMpeg or VLC, it can be cropped to the correct ratio without reencoding.