Why isn't there any chrome extensions outside of the Chrome web store?

Ok, so we all know that Google doesnt allow video downloader extensions to download from Youtube. My question is, from the many video downloaders why dont they make a Youtube compatible one and put it on their own website or something. . BTW, I checked out www.chromeextensions.org but every ext I downloaded gave... show more Ok, so we all know that Google doesnt allow video downloader extensions to download from Youtube. My question is, from the many video downloaders why dont they make a Youtube compatible one and put it on their own website or something. .
BTW, I checked out www.chromeextensions.org but every ext I downloaded gave me an 'invalid crx header', so thats not an option.
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