Also relevant: <a href="https://news.ycombinator.com/item?id=31324439" rel="nofollow">https://news.ycombinator.com/item?id=31324439</a>
(Incomplete?) list of repositories that have Bzip3:<p><a href="https://repology.org/project/bzip3/versions" rel="nofollow">https://repology.org/project/bzip3/versions</a>