The same is true for existing Linux package managers. You could say apt = git, Debian repos = Github.
Its not entirely true either because neither git nor Github do things like dependency handling.
There are lots of alternatives to Github. Of the two alternatives to Flathub mentioned in the article, one has disappeared, and the other has all of 93 packages.
Good to have more Linux-compatible hardware, but currently x86-64 is a safer bet for compatibility. Asahi, Snapdragon ARM,.. are all half baked Linux projects
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