The reason they aren't is because methods for cracking DRM like Widevine are kept extremely secret so that the exploits don't get patched. It does mean that a lot of content is locked to whatever the scene decides is worth their time to crack and distribute, but if anyone made the methods they use public, they would stop working very quickly.
This happened with a version of Denuvo. Someone leaked an unobfuscated cracked version of a game (I think it was Need for Speed), giving Denuvo the opportunity to study how their protection got cracked.
You'll get worse quality. Widevine doesn't let you play 4K content on unapproved systems. It's also way less convenient. Obviously, pirates are not affected because they can just download Star.Wars.XII.Galactic.Boogaloo.WEBRIP.4K-DarkNaruto69.mkv, it's only an issue if you try to watch content legally for some reason.