Are there security implications to referencing webpages sequentially?

Question

For instance, what is the reasoning behind YouTube URL assignment using the format:

?v=qv-8pquw9wQ

?v=lW5kB906mh8

?v=SwUg7oTZoTY

Instead of:

?v=0Cn0phjvk8a

?v=0Cn0phjvk8b

?v=0Cn0phjvk8c

Answer 1

Enumeration of the URLs would be trivial in the sequential assignment and leak the order and existence of prior videos such as ones that aren't publicly visible.