If you truly have $0 to spend:

Watching a 45-minute video on the Renin-Angiotensin-Aldosterone System is effective, but reviewing that video for a board exam is inefficient. Students crave the "CliffNotes" version—the static images they can annotate. The search for the PDF is a search for efficiency in a high-stakes environment.

"Wait, what?" Leo whispered, his finger hovering over the power button.

To understand why the search for free downloads is so prevalent, one must examine the user base: pre-medical and medical students, often burdened by significant debt and information overload.

Ninja Nerd frequently posts in their YouTube video descriptions and community tab. For example, their “Neurology” or “Renal” series often has 1-2 free downloadable image packs per playlist.