Requests cost nothing, data storage and bandwidth usage do.
People upload over 500 hours of videos every minute, that's 256.320.000hours each year. Let's say that most of it is lower quality instead of 4K, so each hour takes 0.5GB of storage. That's 128PB every year. Youtube overall size probably reached Exabytes in the last few years.
Their daily bandwidth usage probably ranges way into Petabytes too, something you were orders of magnitude away over the whole life cycle of your site.