Those sites are vast. There are billions of videos, subreddit posts, etc. It's all under one name but so was all of Geocities. You couldn't even begin to consume all of what is produced on those sites.
They are also algorithmically curated and have a heavy bias towards new content.
Those sites vs the old Internet is basically the difference between a modern supermarket and a flea market, both provide you with lots of stuff, but it's a completely different experience.
