What's In The Rabbit Hole Of YouTube Video IDs?

Timestamp:

0:00 The number is wrong
0:54 Base64 counting system
2:06 A conversation in 2004
3:02 DES and 3DES encryption
5:20 An imaginary security risk
6:48 Birthday paradox
8:05 Estimating the size of YouTube

References:

[yusufs.dawood]

So what was the probability that I would end up commenting on this video after landing on this page with no active intention on searching for the content or trying to do anything even close to being taught about in this video?

[MagicGonads]

There's probably a trivial amount of filtering on the resulting IDs too so they don't contain some specific substrings

[nadyanabahi]

video about the backdoor? and the statistics