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uBlock Origin is no longer available in the Chrome store
(chromewebstore.google.com)
This is a most excellent place for technology news and articles.
H.265 is patent encumbered. Blame the 2 or 3(?) patent pool holders (for-profit corporations, unlike non-profit -and-slowly-losing-market-share Mozilla) for not making it free to use for everyone.
This is why AV1 is preferred, it saves bandwidth and there's no threat of being sued into oblivion.