Technically speaking, sharing the shader cache is illegal. Just like sharing the game files is illegal. You can 100% still find complete shader caches online, and it’s just a matter of dropping them into the correct folder. But again, it’s technically illegal to do, so you’ll likely need to visit some sketchy sites with your adblocker enabled.

The shaders are akin to the uncompressed game files, which are ready to use. It’s not a perfect comparison, but that’s the short version. So the shader cache will likely be just as large as the actual game.