This has to be Numberphile's worst video. No motivation given, no explanation as to how each set of rules is generated (yes, we figured it out eventually), and no actual mathematical insight at all. It's just "First, I'll write a bunch of ones, then some other integer sequences, and then finally rational sequences. The end."
I feel like Numberphile's videos have been extra short and lacking in quality recently. Is this intentional for YouTube algorithm reasons, or have they just lost their magic?