GitLab has been doing an excellent work of integrating CI/CD tools with their code hosting solution; I'm guessing thats what you're talking about.
Specifically for Github, I believe they want to focus on hosting and developing (reviewing and managing) code and not on owning the CI/CD tools. They do provide many many integrations with different tools (TravisCI, Jenkins etc.). Which is a good thing: I want Github to be working on making code development better and remain agnostic of pipeline tools, which come and go as fashion dictates (OK I'm being a little harsh but my point is that I should be able to choose my CI/CD tools while having all my code live in Github).
Specifically for Github, I believe they want to focus on hosting and developing (reviewing and managing) code and not on owning the CI/CD tools. They do provide many many integrations with different tools (TravisCI, Jenkins etc.). Which is a good thing: I want Github to be working on making code development better and remain agnostic of pipeline tools, which come and go as fashion dictates (OK I'm being a little harsh but my point is that I should be able to choose my CI/CD tools while having all my code live in Github).