Not everything mentioned is actually open source, but a decent amount is.

Love these guys for VFX but man this video is obnoxious.

I can't stand the youtubeness of this video for long so forgive me if they mention this, but Weta, ILM, Pixar, Blizzard Cinematics Dept, Blue Sky (RIP), Rhythm & Hues (RIP), Buf, etc. used or have used Linux for years. Unix/Linux were the OG operating systems for computer graphics. Game studios are very Windows-centric.

That video thumbnail alone made me skip clicking it

Easily their worst challenge. I watched it yesterday and the comments were roasting them for setting them up to fail with gnome. This was less of a VFX challenge and more of a Figure Out A New Operating System With An Unfamiliar UI challenge.

And then the things that burned them weren't the fault of the software or OS