You could get pretty close to the cost 1$/TB/month using Hetzner's sx135 with 8x22TB so 140TB in raidz1 for 240 eur. Maybe you get a better rate if you rent 200 of them. Someone else takes care of a lot of risks and you can sleep well at night

yeah it's totally plausible that we go with something like this in the future. We have similar offers where we could separate out either the financing, the build-out, or both and just do the software.

(for Hetzner in particular it was a massive pain when we were trying to get CPU quotas with them for other data operations, and we prob don't want to have it in Europe, but it's been pretty easy to negotiate good quotes on similar deals locally now that we've shown we can do it ourselves)

You cannot use hetzner for anything serious.

They'd most likely claim abuse and delete your data wholesale without notice

100% this. Hetzner has no problems completely blowing away whatever you've got running for arbitrary reasons. And their support is incresibly bad.

I don't think Hetzner provides locations in SF. Those 100GBit connections don't do much if they need to connect outside the city the rest of the equipment is in, but maybe peering has gotten better and my views are outdated.

You're good. The speed of light through a glass fiber is still just as slow as it ever was.

Your math does not math. It is more like $2/TB/month with minimal redundancy.