It's been bad because it's crowded out better things. When you put something shit on the market for free you destroy most of the will for customers to pay for a thing, even if it's good, because they can just use the shit free version. This can be an intentional business strategy.
So, I lived through the Internet Explorer age so I'm familiar with that. I think it is a leap to say there are better alternatives dying to get out. There's no objective way to decide they are stifling innovation.
I'm not sure there's some solution for what you're complaining about other than the government coming in and saying they have to split github. What are you advocating for here, or is this just complaining?
