"Change the default branch on github." is correct?

Isi a technical sentence. Github is a website. Need I use "in" or "on" for a website? I do not care what is more appropriate. I care about what is right and why.


Change the default branch on github.

is correct.

Github is a hosting service and source code is placed on it, not in it.

In general, things are

on websites
on servers
on disk


in file systems.

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