I don't know about GitHub or GitLab, but in my entire professional career, I think my total downtime due to failures in locally hosted Git repos is zero. Likewise I don't recall ever having a problem due to locally hosted bug trackers or code review systems. This stuff isn't hard, and we've been able to do it reliably for a very long time.
What certainly has wasted a horrible amount of my time in recent years is working around build systems and package managers that are so badly designed that not only do they have a dependency on some online repository in the first instance, they also make it difficult or impossible to download and cache those dependencies in a supported way so that you can have 100% reproducible builds with nothing but locally hosted resources. Surely this is just about the most basic requirement for a robust software development process?
What certainly has wasted a horrible amount of my time in recent years is working around build systems and package managers that are so badly designed that not only do they have a dependency on some online repository in the first instance, they also make it difficult or impossible to download and cache those dependencies in a supported way so that you can have 100% reproducible builds with nothing but locally hosted resources. Surely this is just about the most basic requirement for a robust software development process?