A monopoly is not inherently bad. They often benefit users with increased efficiency and productivity. They're only bad when progress stagnates and/or prices rise.
In this case, Github is actively competing and adding features that helps all of their users. If that means that some other companies lose market share then it's just a sign that the value proposition has changed. I see no problem with this, it's how the market works.
In this case, Github is actively competing and adding features that helps all of their users. If that means that some other companies lose market share then it's just a sign that the value proposition has changed. I see no problem with this, it's how the market works.