I saw a thumbnail on Youtube that said "GitHub is killing open source" and I think the sheer wrongness of the statement surmises the entire idea very well.

There are many things that I don't like about Github, but I think the most important one is that Github doesn't allow users to have multiple free accounts.

You can create as many accounts as you want on Reddit, have as many blogs as you want on Tumblr, and even create multiple personae on Facebook on a single account, but Github doesn't allow you to do any of that.

You can't be a "hacker" platform when you give users less control over their privacy than Facebook provides.

I assume that is a bigger problem when you consider everyone decided to stop hosting their own forum and moving all their discussion to Github issues and Github's built-in forum.