Go is a little different here- originally it was totally decentralized, there was no central registry, just URLs. So you could depend on everything, no effect on other packages. No rules on publishing or unpublishing either, because you just get to run your repo the way you want.

At some point, Russ Cox got the Fear about this, and now https://proxy.golang.org/ is an on by default, caching proxy in the middle. You can still delete your packages whenever you want to though.