My wild guess (!) is..
there aren't that many people proficient enough in web-development to have the guts for live-coding and talking while coding, AND to have the time doing it on a regular basis.
web-dev isn't that exciting per se. game-dev and similar fields are "cool" in a way, so the audience isn't just other game-devs, but all kinds of other devs. But I really can't imagine a web-dev or AI-Engineer casually being excited about web-dev and watching others doing it.
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