What I'm aware of are services which do not charge extra for egress but severely limit your egress bandwidth (like 10 Gbit peak, 100 Mbit avg)

And limiting egress bandwidth is better is better done in the service per client than by the hoster for your system

Check this out. You _almost_ use the most expensive service.

I think you should expand your awareness. Hetzner for instance doesn't mention anywhere that they throttle your 10gbit uplink, but they limit to 20TB/month, with ~1EUR for every TB over. Seems like you wouldn't even have noticed what you described in your article.

Sure there are cheaper options then GCS but, there is no one providing unlimited free bandwidth