Earlier quoted context omitted.
> youtube-dl is a tool mostly used by techies anyways This is just speculation, but I think that there may have been a tipping point reached where it is no longer being just used by CLI "techies". It has been incorporated into other tools which appeal to a much wider userbase - many of whom will never know they are using it behind the scenes. For example, there is: a user-friendly front-end for it in Kodi [1], an eas…
Those tools are built by developers, which will have no issue with getting access to youtube-dl in more technical ways.
Of course you don't need GitHub to run an open source software project, you could conceivably do it with IPoAC[1] if you really wanted to. But in the real world, being kicked off the most popular platform of its kind, and losing the community and integrations that come with it, is going to slow the project down.