One thing that comes to mind, regarding "Sesame Street" on YouTube...
Do you suppose that, if episodes get removed from HBO Max and replaced with different episodes of the same series, could it be possible these episodes may someday be published on the show's official YouTube channel afterwards? I mean, some reruns previously aired on HBO have likely appeared on the show's official YouTube channel, and an early 1993 episode currently on HBO Max ("The Worm Winter Games", to be exact) was already on YouTube before it appeared on HBO Max. I am sure that someday, we may see some or even many of the old school episodes on the show's official YouTube channel down the road for free viewing. But for now, it's wishful thinking.