The creators are using "Shadow Permissions." Many smart fans set their Drive links to "Anyone with the link can view" but don't publish the link. Google cannot index these. You need to find those links on Reddit/Twitter first.
While searching for "site:drive.google.com la casa de papel" site drive.google.com la casa de papel
: Videos can be easily streamed or saved directly to smartphones and tablets via the official Google Drive app. The Hidden Dangers of Downloading Public Drive Files The creators are using "Shadow Permissions