> only notice one going offline during games (Docker Hub)

Even if it only affected DockerHub, that's sufficient to break many modern developer workflows.

It is however not only DockerHub - as I mentioned upthread, GitHub and AWS are both routinely affected. I've also had npm and crates.io blocked at various times.

You may be getting lucky with how closely your particular ISP is adhering to the block requests, but others are less lucky.