In short, the Go module proxy causes an excessive traffic volume on git VCS sources with frequent clones of unchanged repos. Regardless of whether or not the developer is/was always reasonable in how he discussed this, he was absolutely right about this being a hostile behavior from the official Go proxy that is the result of bad/insufficient engineering. The team's suggestions to simply stop refreshing his one domain were also not sufficient given that the problem clearly impacts all Go module VCS hosts.

The developer also appeared to be banned in a way that violated the Go CoC's own provisions around fair notice and a proper hearing, which is super disappointing to see.