In Tom Scott's vid "5 Things You Can't Do On British TV," Tom says that folks on YT allocating a good amount of funds or hours on vids should add captions. https://www.youtube.com/watch?v=m__OZ3ZsO4Y
You can find paid third-party captioning firms which big YT ppl. could probably afford. As Tom puts it (as an approximation), "'Oh, look, I bought a Lamborghini.' Buy a damn caption!"
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