UPDATE - Okay here's the state of play folks. regarding YouTube preview thumbnails.
It now works. Mostly. Still figuring out how to tackle the 74,000 orphaned thumbnails in your posts where COSO tried to snag a preview but failed. Depending on how the YT link was formatted (mobile, web or YT shortened URL) - it may or may not repopulate.
But here's the good news: it now supports preview generation for not only Youtube regular videos but also channels, and shorts.
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@CanisPundit @th3j35t3r But it's worth extra-credit points for sticking it to Da Man!