Fair use is much more narrow than most people think, it's just that most rights-holders are not very belligerent. For example, streaming video games does not fall under fair right, most video essays critiquing films or series use way too much material commentated for fair right, remixing as a whole is not fair use, and most fan works are definitely not fair use. Legal protections don't help here, but the shit-storms companies like Nintendo of America had to endure when they tried to tighten the screws.

And that's in the US, other countries have similar exceptions but they are also usually quite limited.